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Problem Symptoms Table

When a malfunction code is not confirmed by a DTC (Diagnostic Trouble Code) check and the cause of problem cannot be identified through a basic inspection, troubleshooting according to the priority order indicated in the table below.

PROBLEM SYMPTOMS TABLE - ENGINE CONTROL SYSTEM

Symptom Suspected Area
Engine does not crank (Does not start)
  1. Starter
  2. Starter relay
  3. Park/neutral position switch
No initial combustion (Does not start)
  1. ECM power source circuit
  2. Fuel pump control circuit
  3. ECM
No complete combustion (Does not start)
  1. Fuel pump control circuit
Engine cranks normally but difficult to start
  1. Starter signal circuit
  2. Fuel pump control circuit
  3. Compression
Difficult to start with cold engine
  1. Starter signal circuit
  2. Fuel pump control circuit
Difficult to start with hot engine
  1. Starter signal circuit
  2. Fuel pump control circuit
High engine idle speed (Poor idling)
  1. A/C signal circuit (Compressor circuit)
  2. Idle air control system
  3. ECM power source circuit
  4. ECM
Low engine idle speed (Poor idling)
  1. A/C signal circuit (Compressor circuit)
  2. Idle air control system
  3. Fuel pump control circuit
Rough idling (Poor idling)
  1. Idle air control system
  2. Compression
  3. Fuel pump control circuit
Hunting (Poor idling)
  1. Idle air control system
  2. ECM power source circuit
  3. Fuel pump control circuit
Hesitation/Poor acceleration (Poor driveability)
  1. Fuel pump control circuit
  2. A/T faulty (1)
Surging (Poor driveability)
  1. Fuel pump control circuit
Engine stalls soon after starting
  1. Fuel pump control circuit
Engine stalls during A/C operation
  1. A/C signal circuit (Compressor circuit)
  2. ECM
Unable to refuel/Difficult to refuel
  1. ORVR system
(1) A/T only
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