Test BB - Temperature Compensated Accelerator Pump (TCP) Test
- Turn ignition off and wait 10 seconds. Disconnect temperature compensated accelerator pump solenoid harness connector. Set DVOM on 200 ohm scale, measure resistance of solenoid. If resistance is between 50-100 ohms, reconnect solenoid and go to next step. If less than 50 ohms or greater than 100 ohms, replace solenoid and repeat Self-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. DVOM will indicate zero volts. Depress and release throttle and observe DVOM. If DVOM registered high voltage, remain in Output State Check and go to step 3). 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. Turn ignition on, engine off. With DVOM on 20 volt scale, connect positive lead to vehicle battery circuit on solenoid and negative lead to temperature compensated pump output circuit at solenoid. While observing DVOM, depress and release throttle several times to cycle output on and off. If output cycles on and off, go to step 4). If output does not cycle on and off, go to step 6).
- Remain in Output State Check. Install vacuum pump to solenoid vacuum supply port and vacuum gauge to solenoid output port. Apply and maintain a minimum of 6 in. Hg vacuum. Depress and release throttle several times to cycle vacuum output on and off and observe vacuum gauge. If vacuum output cycles on and off, go to step 5). If vacuum does not cycle on and off, replace solenoid and repeat Self-Test.
- Remove all test equipment and vacuum source. Disconnect vacuum lines at temperature compensated accelerator pump solenoid. Start engine and check for vacuum. If vacuum is present, EEC-IV system is operating properly, check fuel system. If no vacuum is present, repair vacuum leak or blockage and repeat Self-Test.
- Turn ignition on (engine off). With DVOM on 20 volt scale, connect positive lead to vehicle power circuit at solenoid connector and negative lead to ground. If voltage is 10.5 volts or less, repair open circuit and repeat Self-Test. If voltage is 10.5 volts or greater, go to step 7).
- Turn ignition off and wait 10 seconds. Disconnect 60-pin connector at ECA and inspect connectors for damage. Repair as required. Connect breakout box and leave ECA disconnected. With DVOM on 200 ohm scale, measure continuity from box pin 54 to temperature compensated pump circuit at harness connector. If resistance is 5 ohms or greater, repair open circuit and repeat Self Test. If less than 5 ohms, go to step 8).
- Turn ignition off and wait 10 seconds. Disconnect harness at pump solenoid. Install breakout box (ECA disconnected). With DVOM on 200K ohm scale, measure resistance from box pin 54 to box pins 37 and 57. If resistance is 10K ohms or greater, go to step 9). If resistance is less than 10K ohms, repair short and repeat Self-Test.
- Turn ignition off and wait 10 seconds. Breakout box installed (ECA and solenoid disconnected). With DVOM On 200K ohm scale, measure resistance from box pin 54 to pins 40, 46, and 60. If readings are less than 10K ohms, repair short to ground and repeat Self Test. If readings are 10K ohms or greater, replace ECA and repeat Self-Test.