With Continuous Memory Code 583

Short To Ground In Power-To-Fuel Pump/FPM Circuit

If Continuous Memory Code 583 is present, go to step 136). If Continuous Memory Code 583 is not present, go to step 144).

136) Attempt To Re-Generate Continuous Memory Code 583 Turn ignition off. Clear continuous memory. See CLEARING CODES under SELF-DIAGNOSTIC SYSTEM. Start engine. If engine will not start, crank engine for 5 seconds. Repeat KOEO SELF-TEST. If Continuous Memory Code 583 is present, code is a hard fault. Go to step 139). If Continuous Memory Code 583 is not present, code is intermittent. Go to step 137).

137) Was KOEO Code 524 Or 543 Present In Step 136) If KOEO Code 524 and/or 543 was present in step 136), an over current condition (short to ground) was present sometime during last 80 warm-up cycles. Go to step 144). If KOEO Code 524 and/or 543 was not present in step 136), go to step 147).

NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 137) to step 139). No test procedures have been omitted.

139) Attempt To Isolate Short To Ground Turn ignition off. Clear continuous memory. Disconnect Inertia Fuel Shutoff (IFS) switch. IFS switch is located in left front of trunk. Crank engine for 5 seconds. Repeat KOEO SELF-TEST. If Continuous Memory Code 583 is present (disregard other codes), go to step 140). If Continuous Memory Code 583 is not present, check for short to ground in power-to-fuel pump circuit. Repair wiring as necessary. After repair is complete, repeat QUICK TEST.

140) Check For Short To Ground In Power-To-Fuel Pump/FPM Circuit Turn ignition off. Ensure IFS switch is disconnected. Disconnect and inspect PCM and VCRM connectors. Clean or repair connectors as necessary. Install breakout box. Leave PCM and VCRM disconnected. Measure resistance between test pins No. 8 and 40 at breakout box. If resistance is more than 10,000 ohms, go to step 141). If resistance is 10,000 ohms or less, repair short to ground in power-to-fuel pump/FPM circuit. Remove breakout box, and reconnect all components. Clear continuous memory. Start engine and wait 5 seconds. Turn ignition off. Repeat QUICK TEST.

141) Check VCRM Turn ignition off. Ensure IFS switch is disconnected. Install breakout box. Leave PCM disconnected. Reconnect VCRM connector. Connect a jumper wire between test pins No. 22 and 40 at breakout box. Turn ignition on. Measure voltage between test pins No. 8 and 60 at breakout box. If voltage is more than 8.5 volts, replace PCM. Remove breakout box, and reconnect all components. Clear continuous memory. Start engine and wait 5 seconds. Turn ignition off. Repeat QUICK TEST. If voltage is 8.5 volts or less, replace VCRM. Remove breakout box, and reconnect all components. Clear continuous memory. Start engine and wait 5 seconds. Turn ignition off. Repeat QUICK TEST.

NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 141) to step 144). No test procedures have been omitted.

144) Check If Engine Starts With High Speed Fuel Pump (HFP) Relay Disconnected Turn ignition off. Disconnect HFP relay. Relay is located in engine compartment fuse block. Attempt to start engine. If engine does not start or starts but runs for less than one minute, go to next step. If engine starts and runs for one minute, reconnect HFP relay. Go to step 127).

145) Check for B (+) To VCRM Turn ignition off. Ensure HFP relay is disconnected. Disconnect and inspect VCRM connector. Clean or repair connector as necessary. Connect negative lead of DVOM to negative battery post. Using positive lead of DVOM, measure voltage at terminals No. 4 (Yellow wire) and No. 5 (Yellow wire) at VCRM connector. If both voltage readings are more than 10.5 volts, go to step 146). If any reading is 10.5 volts or less, repair open in B (+) supply to VCRM. Ensure all related fuses are okay. Reconnect all components. Repeat QUICK TEST.

146) Check Power-To-Fuel Pump Circuit Continuity Turn ignition off. Disconnect HFP relay. Measure resistance between terminal No. 24 (Pink/Black wire) and power-to-fuel pump terminal at HFP relay. See Figure. If resistance is less than 10 ohms, replace VCRM. Reconnect all components. Repeat QUICK TEST. If resistance is 10 ohms or more, repair open in power-to-fuel pump circuit between VCRM and Fuel Pump Monitor (FPM) splice. Reconnect all components. Repeat QUICK TEST.

147) Check For Intermittent Short To Ground In Power-To-Fuel Pump Circuit Turn ignition off. Visually inspect power-to-fuel pump circuit between VCRM and fuel pump. Also, inspect Fuel Pump Monitor (FPM) circuit to PCM and power-to-fuel pump circuit at High Speed Fuel Pump (HFP) relay. Repair wiring as necessary. Install a fuel gauge or listen to fuel pump to check if fuel pump quits while performing wiggle test. Start engine. Shake, wiggle and bend Pink/Black wire (power-to-fuel pump circuit) between VCRM, fuel pump, PCM and HFP relay. To simulate road shock, lightly tap on Inertia Fuel Shutoff (IFS) switch, fuel pump, HFP relay, VCRM and fuel pump. If fuel pump stops, fuel pressure drops or engine stalls or stumbles, a short to ground in power-to-fuel pump circuit has been detected. Isolate fault and repair as necessary. Clear continuous memory (Code 583 should have been set). Start engine and wait 5 seconds. Turn ignition off. Repeat QUICK TEST. If no fault is detected, go to step 148).

148) Again, Check For Intermittent Short To Ground In Power-To-Fuel Pump Turn ignition off. Disconnect PCM, VCRM and fuel pump. Inspect connectors. Clean or repair connectors as necessary. Install breakout box. Leave PCM, VCRM and fuel pump disconnected. Connect a test light between test pins No. 1 (KAPWR) and No. 8 (FPM) at breakout box. Observe test light, and shake, wiggle and bend Pink/Black wire (power-to-fuel pump circuit) between VCRM, fuel pump, PCM and HFP relay. To simulate road shock, lightly tap on Inertia Fuel Shutoff (IFS) switch, fuel pump, HFP relay and VCRM. If a fault is detected, test light will turn on, indicating a short to ground. If a short to ground is detected, isolate fault and repair wiring as necessary. Start engine and wait 5 seconds. Turn ignition off. Repeat QUICK TEST. If a short to ground is not detected, fault is intermittent and cannot be duplicated at this time. Testing is complete. Reconnect all components. For further diagnosis, see TESTS W/O CODES article in this section.

NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 148) to step 150). No test procedures have been omitted.

150) Continuous Memory Code 524, 543 Or 556 Continuous Memory Code 524 or 543 indicates that when PCM commanded fuel pump on, voltage was not detected at the power-to-fuel pump circuit. Code 524 refers to low speed output (VCRM terminal No. 24; Pink/Black wire). Code 543 refers to high speed output. It is not possible to distinguish between circuits due to vehicle wiring and fuel pump operating strategy. Following are possible causes for these faults.

Open In Power-To-Fuel Pump Circuit Between VCRM And FPM Splice
Open In B (+) Supply To VCRM (Terminals No. 4 And 5)
Left HO2S Short To Power

Continuous Memory Code 556 indicates that sometime during vehicle operation, fuel pump primary circuit failure occurred. Possible cause for this fault is an open or short in fuel pump circuit (PCM terminal No. 22). If Continuous Memory Code 583 is also present, go to step 136). If Continuous Memory Code 583 is not present, go to step 151).

151) Check Power-To-Fuel Pump & Fuel Pump Circuits Start engine. Disconnect High Speed Fuel Pump (HFP) relay. Relay is located in engine compartment fuse block. Connect a test light between ground and power-to-fuel pump terminal at HFP relay connector. If a fault is detected, test light will turn on, indicating a short to ground. Also, listen for engine stall/stumble or fuel pump turning off. Observe test light and perform the following:

For Code 524 or 543, shake, wiggle and bend Pink/Black wire (power-to-fuel pump circuit) between terminal No. 24 at VCRM and Fuel Pump Monitor (FPM) splice. Also shake, wiggle and bend Yellow wire (B (+) circuit) between terminals No. 4 and 5 at VCRM.
For Code 556, shake, wiggle and bend Light Blue/Orange wire (fuel pump circuit) between terminals No. 22 at PCM and No. 18 at VCRM.

If a short to ground is detected, isolate fault and repair wiring as necessary. Clear continuous memory. Repeat QUICK TEST. If Code 556 is present and a short to ground is not detected, go to step 152). If Code 556 is not present and a short to ground is not detected, go to step 158).

152) Check For Intermittent Short To Ground In Fuel Pump Circuit Turn ignition off. Disconnect and inspect PCM and VCRM connectors. Clean or repair connectors as necessary. Connect ohmmeter between terminals No. 18 (Light Blue/Orange wire) and No. 1 (Black wire) at VCRM connector. Observe ohmmeter, and shake, wiggle and bend Light Blue/Orange wire (fuel pump circuit) between VCRM and PCM connectors. Also check fuel pump circuit to Data Link Connector (DLC). If a fault is detected, ohmmeter will show continuity, indicating a short to ground. If continuity exist, isolate fault and repair wiring as necessary. Clear continuous memory. Repeat QUICK TEST. If no continuity exists, fault is intermittent and cannot be duplicated at this time. Testing is complete. Reconnect all components. For further diagnosis, see TESTS W/O CODES article in this section.

NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 152) to step 155). No test procedures have been omitted.

155) Continuous Memory Code 542 Continuous Memory Code 542 indicates that one of the following conditions has occurred.

Fuel Pump Circuit Activated When PCM Expected Circuit To Be Off
Open In Fuel Pump Monitor (FPM) Circuit, Power To Fuel Pump, Fuel Pump Or Fuel Pump Ground Circuit
Short To Power In FPM Or Power-To-Fuel Pump Circuits
VCRM Output Driver Or High Speed Fuel Pump (HFP) Relay Contacts Stuck Closed
Short To Ground In HFP Circuit
Short To Power In Left HO2S Signal Circuit
Engine Stall Due To Excessive Load

Start engine. Check for engine stall/stumble while performing the following (if possible, listen for fuel pump turning off). Shake, wiggle and bend Pink/Black wire (power-to-fuel pump circuit) between fuel pump and FPM splice. To simulate road shock, lightly tap on fuel pump, Inertia Fuel Shutoff (IFS) switch and VCRM. If engine stalls or stumbles, isolate fault and repair wiring as necessary. Clear continuous memory. Repeat QUICK TEST. If engine does not stall or stumble, go to step 156).

156) Check For Intermittent Open Or Short In FPM, Power-To-Fuel Pump & Fuel Pump Ground Circuits Turn ignition off. Disconnect and inspect PCM connector. Clean or repair connector as necessary. Install breakout box. Leave PCM disconnected. Connect a test light between test pins No. 8 and 37 at breakout box. Turn ignition on. Observe test light, and shake, wiggle and bend the following circuits.

Fuel Pump Monitor (FPM) Circuit
Power-To-Fuel Pump Circuit
Fuel Pump Ground And HFP Relay Circuits Between HFP Relay And VCRM

To simulate road shock, lightly tap on Inertia Fuel Shutoff (IFS) switch, VCRM and HFP relay. If a fault is detected, test light will turn off indicating an open circuit. Test light will also turn off and fuel pump will run, if a short to power or HFP circuit short to ground is detected. If a fault is detected, isolate fault and repair wiring as necessary. Remove breakout box. Reconnect all components. Repeat QUICK TEST. If a fault is not detected, go to step 158).

NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 156) to step 158). No test procedures have been omitted. Due to internal circuitry of PCM, an intermittent short to power in left HO2S signal may produce a Continuous Memory Code 524, 542 or 543.

158) Check For Short To Power In Left HO2S Turn ignition off. Install breakout box. Leave PCM disconnected. Connect test light between test pins No. 43 and 40 at breakout box. Turn ignition on. Observe test light and shake, wiggle and bend Red/Black wire between left HO2S and PCM connector. To simulate road shock, lightly tap on left HO2S. If a fault is detected, test light will turn on bright, indicating a short to power. If a short to power is detected, isolate fault and repair wiring as necessary. Remove breakout box. Reconnect all components. Repeat QUICK TEST. If a short to power is not detected, fault is intermittent and cannot be duplicated at this time. Testing is complete. Reconnect all components. For further diagnosis, see TESTS W/O CODES article in this section.

NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 158) to step 160). No test procedures have been omitted.

160) Lack Of Power/Hard Start; Check HFP Relay Operation Turn ignition off. Disconnect HFP relay. Relay is located in engine compartment fuse block. Measure voltage between negative battery post and B (+) terminal at HFP relay connector. See Figure. Turn ignition on. Measure voltage between IGN START/RUN terminal at HFP relay connector and negative battery post. If both voltage readings are more than 10.5 volts, go to step 161). If any reading is 10.5 volts or less, repair open in B (+) or IGN START/RUN circuit. Also, ensure all related fuses are good. After repair is completed, reconnect all components. Recheck system operation.

161) Check Power-To-Fuel Pump Circuit Continuity Turn ignition off. Disconnect HFP relay connector. Measure resistance between negative battery post and POWER-TO-FUEL PUMP terminal at HFP relay connector. See Figure. If resistance is less than 10 ohms, go to step 162). If resistance is 10 ohms or more, repair open in power-to-fuel pump circuit between HFP relay and splice to main power-to-fuel pump circuit. After repair is completed, reconnect all components. Recheck system operation.

162) Check VCRM & HFP Circuit Operation Turn ignition off. Reconnect HFP relay. Start engine. Run engine until normal operating temperature is reached. Turn ignition off. Disconnect HFP relay. Connect DVOM between terminals B (+) and HFP at HFP relay connector. See Figure. Ensure all accessories are off. Observe DVOM and start engine. Within 10 seconds of start, record DVOM voltage. Observe DVOM and allow engine to idle for 2 minutes. If voltage reading taken at 10 seconds decreases a minimum of 0.4 volt within 2 minutes of running engine, VCRM and HFP circuits are okay. Turn ignition off. Check HFP relay. Go to step 163). If voltage reading taken at 10 seconds does not decrease a minimum of 0.4 volt within 2 minutes of running engine, turn ignition off. Go to step 165).

163) Check HFP Relay Turn ignition off. Disconnect HFP relay. Connect a jumper wire between positive battery post and IGN START/RUN terminal at HFP relay. See Fig 1. Connect one end of another jumper wire to HFP terminal at HFP relay. Listen to HFP relay and touch remaining end of jumper wire to negative battery post. If relay clicks, relay is working properly. Remove jumper wires and reconnect HFP relay. If relay does not click, replace relay. Reconnect all components. Recheck system operation.

Fig 1: Identifying High Speed Fuel Pump (HFP) Relay Terminals

NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 163) to step 165). No test procedures have been omitted.

165) Check HFP Circuit Continuity Turn ignition off. Disconnect HFP relay. Disconnect and inspect VCRM connector. Clean or repair connector as necessary. Measure resistance between terminal No. 10 (Brown/White wire) at VCRM connector and HFP terminal at HFP relay connector. See Fig 1. If resistance is less than 5 ohms, go to step 166). If resistance is 5 ohms or more, repair open in HFP circuit (Brown/White wire). Reconnect all components. Recheck system operation.

166) Check For Short To Power In HFP Circuit Turn ignition off. Ensure VCRM and HFP relay are disconnected. Turn ignition on. Measure voltage between negative battery post and HFP terminal at HFP relay connector. See Figure. If voltage is less than one volt, go to step 167). If voltage is one volt or more, repair short to power in HFP circuit. Reconnect all components. Recheck system operation.

167) Check For Short To Ground In HFP Circuit Turn ignition off. Ensure VCRM and HFP relay are disconnected. Measure resistance between negative battery post and HFP terminal at HFP relay connector. See Figure. If resistance is more than 10,000 ohms, replace VCRM. Reconnect all components. Recheck system operation. If resistance is 10,000 ohms or less, repair short to ground in HFP circuit. Reconnect all components. Recheck system operation.

NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 167) to step 170). No test procedures have been omitted.

170) KOEO & Continuous Memory Code 587: Check Wiring Harness Code 587 indicates a Data Link Connector (DLC) failure between PCM and VCRM. DLC includes data (+) and data (-) circuits. Following are possible causes for this fault.

Open Or Short In Data (+) Or Data (-) Circuits
Damaged VCRM
Damaged PCM Check wiring harness containing data (+) (Tan/Orange wire) and data (-) (Pink/Light Blue wire) circuits between VCRM and PCM connectors for proper installation, location (not close to high voltage wires) and for aftermarket modifications.

Relocate or repair wiring as necessary. Clear continuous memory. Start engine. Turn A/C on and wait 15 seconds. Turn A/C and ignition off. Repeat QUICK TEST. If KOEO Code 587 is present and wiring is okay, go to step 171). If Continuous Memory Code 587 is present and wiring is okay, go to step 180).

171) Check Data (+) & Data (-) Circuit Continuity Turn ignition off. Disconnect any test equipment connected to Data Link Connector (DLC). Leave equipment disconnected throughout procedure unless otherwise instructed. Disconnect and inspect VCRM and PCM connectors. Clean or repair connectors as necessary. Install breakout box. Leave PCM disconnected. Measure resistance between test pin No. 18 at breakout box and terminal No. 21 (Tan/Orange wire) at VCRM connector. Also, measure resistance between test pin No. 19 at breakout box and terminal No. 23 (Pink/Light Blue wire) at VCRM connector. If both resistance readings are less than 5 ohms, go to step 172). If any reading is 5 ohms or more, repair open in Tan/Orange and/or Pink/Light Blue wire. Reconnect all components. Start engine. Turn A/C on and wait 15 seconds. Turn A/C and ignition off. Repeat QUICK TEST.

172) Check For Short To Power In Data (+) & Data (-) Circuits

Ensure breakout box is installed, and PCM and VCRM are disconnected. Measure voltage between test pins No. 18 and 40, and pins No. 19 and 40 at breakout box. If both readings are less than one volt, go to step 173). If any reading is one volt or more, repair short to power in data (+) (Tan/Orange wire) and/or data (-) (Pink/Light Blue wire) circuits. Remove breakout box. Reconnect all components. Start engine. TurnA/C on and wait 15 seconds. Turn A/C and ignition off. Repeat QUICK TEST.

173) Check For Short To Ground Or Short To Each Other In Data (+) & Data (-) Circuits Turn ignition off. Ensure breakout box is installed, PCM and VCRM are disconnected. Measure resistance between test pins No. 18 and 40, pins No. 18 and 19, and pins No. 19 and 40 at break-out box. If all readings are more than 10,000 ohms, go to step 174). If any reading is 10,000 ohms or less, repair short to ground as necessary. Remove breakout box. Reconnect all components. Start engine. TurnA/C on and wait 15 seconds. Turn A/C and ignition off. Repeat QUICK TEST.

174) Check Data Link Connector (DLC) To VCRM Turn ignition off. Ensure all test equipment is disconnected from DLC. Ensure breakout box is installed and PCM is disconnected. Reconnect VCRM connector. Turn ignition on. Measure voltage between test pins No. 18 (data (+) circuit) and No. 19 (data (-) circuit) at breakout box. If voltage is 3.5-5.3 volts, go to step 175). If voltage is not 3.5-5.3 volts, turn ignition off. Replace VCRM. Remove breakout box. Reconnect all components. Start engine. Turn A/C on and wait 15 seconds. Turn A/C and ignition off. Repeat QUICK TEST.

175) Check Data (-) Circuit In VCRM Turn ignition off. Ensure all test equipment is disconnected from Data Link Connector (DLC), breakout box is installed and PCM is disconnected. With VCRM connected, measure resistance between test pins No. 19 (data (-) circuit) and No. 40 (GND) at breakout box. If resistance is 1500-2500 ohms, go to step 176). If resistance is not 1500-2500 ohms, turn ignition off. Replace VCRM. Remove breakout box. Reconnect all components. Start engine. TurnA/C on and wait 15 seconds. Turn A/C and ignition off. Repeat QUICK TEST.

176) Verify That PCM Can Communicate With DLC The purpose of this test is to verify that PCM can communicate with DLC. A scan tool is required for this test step. Follow manufacturer instructions to hook up equipment. Turn ignition off. Remove breakout box. Reconnect PCM. Connect scan tool to DLC. Start engine. While in DLC display, view RPM Parameter Identification (PID). Monitor RPM, and change engine speed. If RPM PID is displayed and changes with engine speed, go to step 177). If RPM PID is not displayed or is displayed but does not change with engine speed, go to step 179).

177) Verify DLC In VCRM Turn ignition off. Ensure PCM and VCRM are connected. Turn A/C off. Enter Output State Diagnostic Test Mode (OS DTM). See OUTPUT STATE CHECK procedure under ADDITIONAL SYSTEM FUNCTIONS. Depress and hold throttle near Wide Open Throttle (WOT) until Malfunction Indicator Light (MIL) flashes once (about 10 seconds). Release throttle. Cooling fan should turn on. Depress throttle to turn cooling fan off. If cooling fan turns on and off as requested, exit OS DTM. Go to step 178).

NOTE: Cooling fan can only be cycled once during OS DTM. To retest, exit and re-enter OS DTM.

If cooling fan does not turn on and off as requested, ensure OS DTM is operating properly. MIL should flash when throttle is depressed and released. If MIL does not flash, check throttle linkage and DLC connections. If OS DTM is operating properly, replace VCRM. Reconnect all components. Start engine. Turn A/C on and wait 15 seconds. Turn A/C and ignition off. Repeat QUICK TEST.

178) Check DLC In VCRM Turn ignition off. Ensure PCM and VCRM are connected. Disconnect cooling fan. Ensure A/C and defroster are off. Perform KOEO SELF-TEST. If KOEO Code 582 is present, reconnect cooling fan. No problem is indicated at this time. Data (+) and data (-) circuits test okay and DLC is operational in PCM. Reconnect all components. If KOEO Code 582 is not present, allow time for engine to cool down to verify that cooling fan does to come on. After engine is cooled, start engine and wait 10 seconds. Turn ignition off. Repeat KOEO SELF-TEST. If KOEO Code 582 is still not present, replace VCRM. Reconnect cooling fan. Start engine. Turn A/C on and wait 15 seconds. Turn A/C and ignition off. Repeat QUICK TEST.

179) Check Data (+) & Data (-) Circuit Continuity To DLC Turn ignition off. Install breakout box. Leave PCM disconnected. Disconnect scan tool from DLC. Measure resistance between test pin No. 18 at breakout box and data (+) terminal (Tan/Orange wire) at DLC. See Fig 2. Also measure resistance between pin No. 19 at breakout box and data (-) terminal (Pink/Light Blue wire) at DLC. If both readings are less than 5 ohms, replace PCM. Remove breakout box. Reconnect all components. Start engine. Turn A/C on and wait 15 seconds. Turn A/C and ignition off. Repeat QUICK TEST. If any reading is 5 ohms or more, repair open circuit as necessary. After repair is complete, return to step 176).

Fig 2: Identifying Data Link Connector (DLC) Terminals

180) Check For Intermittent In Data (+) & Data (-) Circuits Perform test while cooling fan is off. Start engine. Ensure A/C is off. Observe cooling fan (for turning on for other than normal operation) and shake, wiggle and bend data (+) (Tan/Orange wire) and data (-) (Pink/Light Blue wire) circuits between PCM and VCRM connectors. To simulate road shock, lightly tap on VCRM. VCRM will turn fan on if DLC fault is detected. If cooling fan turns on, for other than normal operation, isolate fault and repair wiring as necessary. Clear continuous memory. Start engine. Turn A/C on and wait 15 seconds. Turn A/C and ignition off. Repeat QUICK TEST. If cooling fan does not turn on, go to step 181).

181) Check For Intermittent Short In Data (+) & Data (-) Ckts Turn ignition off. Disconnect test equipment from Data Link Connector (DLC). Disconnect and inspect PCM and VCRM connectors. Clean or repair connectors as necessary. Install breakout box. Leave PCM and VCRM disconnected. Connect a jumper wire between data (+) (Tan/Orange wire) and data (-) (Pink/Light Blue wire) circuits at DLC See Fig 2. Connect test light between test pins No. 19 and 37 at breakout box. Observe test light, and shake, wiggle and bend data (+) (Tan/Orange wire) and data (-) (Pink/Light Blue wire) circuits between PCM and VCRM connectors. If a fault is detected, test light will turn on, indicating a short to power. Disconnect jumper wire. Reconnect test light between test pins No. 19 and 40 at breakout box. Observe test light, and shake, wiggle and bend data (+) (Tan/Orange wire) and data (-) (Pink/Light Blue wire) circuits between PCM and VCRM connectors. If a fault is detected, test light will turn on, indicating a short to ground. If a short is detected, isolate fault and repair wiring as necessary. Remove breakout box, and reconnect all components. Start engine. Turn A/C on and wait 15 seconds. Turn A/C and ignition off. Repeat QUICK TEST. If a short is not detected, go to step 182).

182) Check For Intermittent Open In Data (+) & Data (-) Ckts Turn ignition off. Ensure breakout box is installed and PCM and VCRM are disconnected. Connect a jumper wire between terminals No. 21 (Tan/Orange wire) and No. 23 (Pink/Light Blue wire) at VCRM connector. Ensure jumper wire does not contact other terminals at VCRM connector. Using an ohmmeter, measure resistance between test pins No. 18 and 19 at breakout box. Observe ohmmeter, and shake, wiggle and bend data (+) (Tan/Orange wire) and data (-) (Pink/Light Blue wire) circuits between PCM and VCRM connectors. If reading increases to more than 5 ohms at any time, isolate and repair open circuit and repair wiring as necessary. Remove jumper wire and breakout box. Reconnect all components. Start engine. Turn A/C on and wait 15 seconds. Turn A/C and ignition off. Repeat QUICK TEST. If reading stays at 5 ohms or less, fault is intermittent and cannot be duplicated at this time. Testing is complete. Remove jumper wire and breakout box. Reconnect all components.