Test S - Canister Purge
- Turn ignition off and wait 10 seconds. Place DVOM on 200 ohm scale. Disconnect canister purge solenoid connector and measure resistance of solenoid. If reading is 40-90 ohms, reconnect solenoid and go to next step. If reading is less than 40 ohms or more than 90 ohms, replace solenoid and repeat Quick Test.
- Turn ignition off and wait 10 seconds. Enter Output State Check. Place DVOM on 20 volt scale. Perform Key On-Engine Off Self-Test until end of Continuous code display. DVOM will indicate 0 volts. Depress and release throttle. If DVOM indicated high voltage, remain in Output State Check and go to next step. If DVOM did not indicate high voltage, depress throttle to wide open position and release. If voltage still does not go high, go to TEST I - NO/WRONG CODES , step 13).
- With test equipment connected as in step 2), connect DVOM positive lead to vehicle power circuit on rear of canister purge solenoid connector and negative lead to canister purge output circuit. While observing DVOM, depress and release throttle several times to cycle output on and off. If output cycles on and off, go to next step. If not, remove jumper wire from self-test input and go to step 5).
- Turn ignition off and wait 10 seconds. Remove jumper wire from self-test input. Disconnect vacuum hose at PCV side of canister purge solenoid. Using vacuum pump, apply 16 in. Hg to solenoid. If solenoid holds vacuum for 20 seconds, EEC system is operating properly. Check fuel evaporation system. If solenoid does not hold vacuum for 20 seconds, replace solenoid and repeat Quick Test. If code 42 still present, check fuel system.
- Turn ignition on (engine off). With DVOM on 20 volt scale, connect positive lead to vehicle power circuit of canister purge solenoid and negative lead to ground. If reading is less than 10.5 volts, repair open circuit in harness and repeat Quick Test. If reading is 10.5 volts or more, go to next step.
- Turn ignition off and wait 10 seconds. Disconnect 60-pin connector at ECA and inspect connector and ECA terminals. Repair as required. Connect breakout box and leave ECA disconnected. Disconnect canister purge solenoid. With DVOM on 200 ohm scale, measure continuity from box pin 35 to canister purge circuit of connector at solenoid. If reading is 5 ohms or more, 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. Set DVOM on 200,000 ohm scale. Breakout box connected and ECA and canister purge solenoid disconnected. Measure resistance from box pin 35 to pins 37 and 57. If reading is 10,000 ohms or more, go to next step. 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 connected and ECA and canister purge solenoid disconnected. With DVOM on 200,000 ohm scale, measure resistance from box pin 35 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 more, replace ECA and repeat Quick Test.