Test Ee - Temperature Compensated Pump (TCP)
- Use only VOM/DVOM, not STAR tester, for this step. Turn key off and wait 10 seconds. Set DVOM on 20-volt scale. Connect DVOM negative test lead to STO at SELF-TEST connector and positive test lead to positive battery terminal. Install a jumper wire between STI and signal return at SELF-TEST connector. Perform KEY ON/ENGINE OFF SELF-TEST until end of CONTINUOUS SELF-TEST codes (DVOM reads zero volts). Depress and release throttle while watching DVOM reading. If reading did not change to a high voltage, depress throttle to WOT position and release. If STO voltage does not go to high reading, go to TEST NN - NO CODES/CODES NOT LISTED , step 17). Leave test equipment hooked up. If reading changes to high voltage, remain in OUTPUT STATE CHECK and go to next step.
- With DVOM set on 20-volt scale, connect DVOM positive lead to VPWR circuit on TCP solenoid and negative test lead to TCP circuit at solenoid. Depress and release throttle several times to cycle TCP on and off. If TCP does not cycle, remove jumper wire from STI and go to step 5). If TCP cycles, go to next step.
- Install vacuum pump to TCP solenoid vacuum supply port and vacuum gauge to output port. Apply a minimum of 6 in. Hg. With vacuum applied, cycle TCP on and off by depressing and releasing throttle while observing vacuum gauge. If vacuum output does not cycle, replace TCP solenoid and repeat QUICK TEST . If vacuum output cycles, go to next step.
- With vacuum lines disconnected at TCP solenoid, start engine and check for vacuum. If vacuum is present, EEC-IV system is okay. Check TCP solenoid. If no vacuum is present, remove vacuum source blockage or repair vacuum leak and repeat QUICK TEST .
- Turn key off and wait 10 seconds. Set DVOM on 200-ohm scale. Disconnect TCP solenoid connector and measure solenoid resistance. If reading is less than 50 ohms or higher than 100 ohms, replace TCP solenoid and repeat QUICK TEST . If reading is between 50 and 100 ohms, connect TCP solenoid and go to next step.
- Turn key on, leave engine off. With DVOM on 20-volt scale, measure voltage at TCP solenoid harness connector between VPWR circuit and ground. If reading is 10.5-volts or less, repair open circuit in harness and repeat QUICK TEST . If reading is 10.5-volts or higher, go to next step.
- Turn key off and wait 10 seconds. Disconnect ECA 60-pin connector. Inspect for and repair any damaged wiring. Install breakout box, leaving ECA disconnected. Set DVOM on 200-ohm scale. Measure resistance between test pin 54 and TCP circuit at harness connector. If reading is 5 ohms or higher, repair open circuit in harness. Repeat QUICK TEST . If reading is less than 5 ohms, go to next step.
- Turn key off and wait 10 seconds. Leave breakout box installed and ECA disconnected. Disconnect TCP solenoid. Set DVOM on 200,000-ohm scale. Measure resistance between test pin 54 and test pins 40, 46, and 60. If any reading is less than 10,000 ohms, repair short to ground and repeat QUICK TEST . If all readings are 10,000 ohms or more, go to next step.
- Turn key off and wait 10 seconds. Leave breakout box installed and ECA and TCP solenoid disconnected. Set DVOM on 200,000 ohm scale. Measure resistance between test pin 54 and test pins 37 and 57. If all readings are 10,000 ohms or higher, replace ECA and repeat QUICK TEST . If any reading is less than 10,000 ohms, repair short to power and repeat QUICK TEST . If code is repeated, replace ECA.