Test SML - Switch Monitor Light: Notes

NOTE: Enter this test only when directed here by SWITCH MONITOR TEST. Switch monitor light is located on Super Star II/Super Mecs adapter. This test is intended to diagnose SML circuit only.

1) Check For Open SML Wire Turn ignition off. Install breakout box, leaving PCM disconnected. Measure resistance between SML test pin (No. 38) at breakout box and SML terminal at data link connector. See Figure. If resistance is less than 5 ohms, go to next step. If resistance is at least 5 ohms, repair open SML wire.

2) Check For Short In SML Wire Turn ignition off. With breakout box installed and PCM disconnected, measure resistance between ground and SML test pin (No. 38) at breakout box. If resistance is more than 10,000 ohms, replace PCM. If resistance is 10,000 ohms or less, repair short in SML wire.

Fig 1: High Presssure Switch Ckt & Connector Terminal ID Type "A" Switch

Fig 2: Type "B" Switch Circuit ID

Fig 3: Blower Motor Switch Circuit & Connector Terminal ID Type "B" Switch

Fig 4: Type "C" Switch Circuit ID

NOTE: Enter this test only when directed here by SWITCH MONITOR TEST. This test is intended to diagnose following switches and circuits: A/C Switch (ACS), Blower Motor Switch (BLMT), Clutch Cycling Pressure Switch (CCPS), Clutch Pedal Position Switch (CPP), High Pressure Switch (HPS), Idle Switch (IDL), Park/Neutral Position Switch (PNP), Power Steering Pressure Switch (PSP), Rear Defroster Switch (DEF) and Wide Open Throttle Switch (WOT).

CIRCUIT PIN IDENTIFICATION

Circuit	Breakout Box Pin No.	PCM Pin	Wire Color
BLMT	22	1P	Orange/Black
CCPS	41	1R	Pink/Black
IDL	18	1T	Brown
PSP	10	1N	Brown/Yellow
DEF	34	1O	Purple

1) Check System Integrity Visually check all wiring, connectors and components for damage, shorting or looseness. If a fault is found, repair as necessary. If no fault is found, go to next step.

2) Check Switch Signal To PCM Install breakout box. Connect PCM to breakout box. Measure voltage between ground and breakout box test pin of switch being tested. Check voltage with switch in open and closed positions. See SWITCH PERFORMANCE CHECK. Voltage should switch from less than one volt (switch closed) to more than 10 volts (switch open). If voltage is as specified, and no other problem or code is found, replace PCM. If voltage is not as specified, go to next step.

3) Check For Open Switch Wire Ensure ignition is off. With breakout box installed, disconnect PCM connectors. Disconnect switch to be tested. Measure resistance between breakout box test pin of switch being tested and corresponding terminal at switch connector. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in wire tested.

4) Check For Short In Switch Wire Ensure ignition is off, breakout box is installed and PCM is disconnected. Measure resistance between ground and breakout box test pin of switch being tested. If resistance is less than 5 ohms, repair short to ground in wire between switch and PCM. If testing PSP or IDL switch, if resistance is 5 ohms or more, replace switch. On all other switches, if resistance is 5 ohms or more, go to next step.

5) Check Ground At Suspect Switch Turn ignition off. Measure resistance between ground and GND terminal at connector of switch being tested. If resistance is less than 5 ohms, replace switch. If resistance is at least 5 ohms, repair open in ground wire.