Test S - EGR On/Off Control
- Turn ignition off and wait 10 seconds. With DVOM on 200 ohm scale, disconnect EGR solenoid connector and measure solenoid resistance. If resistance is 65-110 ohms, connect EGR solenoid and go to next step. If resistance is less than 65 ohms or greater than 110 ohms, replace EGR solenoid and repeat QUICK TEST .
- Turn ignition off and wait 10 seconds. Enter Output State Check and perform KEY ON-ENGINE OFF (KOEO) SELF-TEST until end of Continuous code display. DVOW will indicate zero volts. Depress and release throttle and observe DVOM. If DVOM registered high voltage, remain in Output State Check and go to next step. If DVOM did not register high voltage, depress throttle to wide open position and release. If voltage still does not register high reading, go to TEST D , step 13).
- Remain in Output State Check. With DVOM on 20 volt scale, connect positive test lead to vehicle power circuit on EGR solenoid and negative lead to EGR output circuit. While observing DVOM, depress and release throttle several times to cycle output on and off. If EGR output cycles on and off, go to next step. If EGR does not cycle on and off, go to step 6).
- Install vacuum pump to the solenoid vacuum supply port and install a vacuum gauge to output port. Apply and maintain minimum of 6 in. Hg. While depressing and releasing throttle to cycle output on and off, observe vacuum gauge. If output cycles on and off, go to next step. If vacuum output does not cycle on and off, replace solenoid and repeat QUICK TEST .
- Remove all test equipment and disconnect vacuum lines at EGR solenoid. Start engine and check for vacuum at solenoid. If vacuum is present, EEC-IV system is functioning properly. If no vacuum is present, service vacuum source blockage or leak and repeat QUICK TEST .
- Turn ignition on (engine off). With DVOM on 20 volt scale, connect positive lead to vehicle power circuit at solenoid and negative lead to ground. Measure voltage. If voltage reading is less than 10.5 volts, repair open circuit and repeat QUICK TEST . If voltage reading is 10.5 volts or greater, go to next step.
- Turn ignition off and wait 10 seconds. Disconnect 60-pin connector at ECA and inspect for damaged pins, corrosion or loose wires and service as necessary. Leave ECA disconnected and connect breakout box to harness. With DVOM on 200 ohm scale, measure continuity from box pin 53 to EGR circuit at harness connector. If reading is 5 ohms or greater, repair open circuit and repeat QUICK TEST . If reading is less than 5 ohms, go to next step.
- Turn ignition off and wait 10 seconds. Breakout box installed and ECA and EGR solenoid disconnected. With DVOM on 200,000 ohm scale, measure resistance from box pin 53 to pins 37 and 57. If reading is 10,000 ohms or greater, go to next step 9). If reading is less than 10,000 ohms, repair short to power and repeat QUICK TEST .
- Turn ignition off and wait 10 seconds. Breakout box installed and ECA disconnected. With DVOM on 200,000 ohm scale, measure resistance from box pin 53 to pins 40, 46 and 60. If reading is less than 10,000 ohms, repair short to ground and repeat QUICK TEST . If reading is 10,000 ohms or greater, replace ECA and repeat QUICK TEST .