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SYSTEM — Engine control module system Malfunction SYMPT OM Reference page Feature of symptom Check point HARD/NO START/ ENGINE STALL HESITATION/SURGING/FLAT SPOT SPARK KNOCK/DETONATION LACK OF POWER POOR ACCELERATION HI IDLE LOW IDLE ROUGH IDLE/HUNTING IDLING VIBRATION SLOW/NO RETURN TO IDLE OVERHEAT/HIGH ENGINE COOLANT TEMPERATURE EXCESSIVE FUEL CONSUMPTION EXCESSIVE OIL CONSUMPTION ABNORMAL SMOKE COLOR DEAD BATTERY (UNDER CHARGE) Malfunction indicator illuminates. Can be detected by CONSULT-II? Fuel cut NO START (with first firing) NO START (without first firing) HARD TO START WHEN ENGINE IS COLD HARD TO START WHEN ENGINE IS HOT AT IDLE DURING DRIVING WHEN DECELERATING BLACK SMOKE WHITE SMOKE New CT/CS AA AB AC AD AE AF AG AH AJ AK AL AM AP HA Engine control module Start signal circuit open, short Start control does not function. Air conditioner switch circuit open, ground short EC-CD-126 Air conditioner does not stop operating. short Air conditioner does not work. Accelerator position switch (Idle) circuit open, ground short q q q short q q q Accelerator position sensor NG signal is output. Ignition switch circuit (ON signal) open q qqq short Engine does not stop. Power supply for ECM circuit open qqq EC-CD-59 short EGRC-solenoid valve circuit open, short ground short q Does not stop operating. Glow relay circuit open qqqq q q q Glow lamp does not turn on. short Glow lamp does not turn of f. Engine control module relay (Self- shutof f) circuit open qqq q EC-CD-59 short q Ground short makes engine unable to stop. Air conditioner relay circuit open EC-CD-126 Air conditioner does not oper- ate. short Air conditioner does not stop operating. Brake switch circuits open q EC-CD-136 short q ECM, Connector circuit open, short qqqqqqqqqqqq q qqqqqqqqqqqq TROUBLE DIAGNOSIS — General Description CD20T Symptom Matrix Chart (Cont’d) EC-49 |