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Troubleshooting

1. Troubleshooting How to Read Flowcharts A flowchart is designed to be used from start to final repair It s like a map showing you the shortest distance But beware if you go off the map anywhere but a stop symbol you can easily get lost START Describes the conditions or situation to start a troubleshooting flowchart bold type ACTION Asks you to do something perform a test set up a condition etc Asks you about the result of an action by giving an answer and asking did you get the same an DECISION over Yes or No STOP The end of a series of actions and decisions describes a final repair action and sometimes directs bold type you to an earlier part of the flow to confirm your repair NOTE The term Intermittent Failure is used several times in these charts It simply means a system may have had a failure but it checks out OK through all your tests You may need to road test the car to reproduce the failure or if the problem was a loose connection you may have unknowingly solved it while doing the tests Open and Short are common electrical terms An open is a break in a wire or at a connection A short is an accidental connection of a wire to ground In simple electronics this usually means something won t work at all In complex electronics like ECUs this can sometimes mean something works but not the way it s supposed to f the electrical readings are not as specif
2. ied when using the PGM FI test harness check the test harness connections before proceeding 6 20 Troubleshooting Flowchart Check Engine warning light isn t on for two seconds after ignition is first turned on Is oil pressure warning light on YES Turn the ignition switch OFF Connect the PGM FI test harness between the ECU and connector page 6 19 Connect B6 terminal to body ground i Turn the ignition switch ON ECU Inspect No 1 fuse Is No 1 fuse OK Replace fuse Repair open in YEL wire be tween No 1 fuse and combi nation meter OOCOCCOCOCCOBOCCCCC0000 F00000000 OOCOCOOCOO FOO Q0O000000 FOCOC0C00 Is Check Engine warning light NO on YES ea Connect the following terminals individually to B6 e A2 e A4 Is Check Engine warning light on YES Substitute a known good ECU and recheck If symp tom indication goes away replace the original ECU Replace light bulb Repair open in GRN ORN wire be tween ECU B6 and combination meter warning OOOOOCOCOCOO FOO 00CO00000 FOOO 00000 YVOOOOOOOO BOO Q0000000 BOOCCC0000 B6 A2 A4 shoe Repair open in BLK wire between ECU A2 and G101 Repair open in BLK wire between ECU A4 and G101 cont d 6 21

Troubleshooting

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