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Diagnostic Information and Procedures: Intermittents

DEFINITION: 

The problem may or may not illuminate the Malfunction Indicator Lamp (MIL) or store a DTC. 

CAUTION: Do not use the DTC tables for intermittent problems. A fault must be present in order to locate the problem. If a fault is intermittent, use of Diagnostic Trouble Code tables may result in the replacement of good parts.
INTERMITTENTS - DIAGNOSIS PROCEDURE

Step Action Value (s) Yes No
1 Were the Important Preliminary Checks performed? - Go to Step 2. Go to Symptom Diagnosis .
2
  1. Perform a careful inspection of any suspect circuits.
  2. Inspect for poor mating of the connector halves, or terminals not fully seated into the connector body.
  3. Inspect for improperly formed or damaged terminals.
  4. Inspect for poor terminal-to-wire connections. This requires removing the terminal from the connector body to inspect it.

Are any problems present?		 - Go to Step 3. Go to Step 4.
3 Repair the electrical connections as needed.
Is the repair complete?		 - System OK -
4 Road test the vehicle with a voltmeter connected to a suspected circuit or a scan tool connected to the Data Link Connector (DLC).
Did the voltmeter or the scan tool indicate an abnormal voltage or scan reading?		 - Go to Step 5. Go to Step 6.
5 Replace the sensor in the affected circuit, if a DTC was stored for this circuit (except for the DTCs P0171 and P0172).
Is the repair complete?		 - System OK -
6 Does an intermittent Malfunction Indicator Lamp (MIL) or DTC occur? - Go to Step 7. Go to Step 8.
7
  1. Check for a faulty relay, Engine Control Module (ECM) driven solenoid, or switch.
  2. Check for improper installation of electrical devices, such as lights, 2-way radios, electric motors, etc.
  3. Inspect the ignition control wires for proper routing (away from ignition wires, ignition system components, and the generator).
  4. Check for a short-to-ground in the MIL circuit or the DLC "test" terminal.
  5. Inspect the ECM ground connections.
  6. Correct or repair the affected circuits as needed.

Is the repair complete?		 - System OK -
8
  1. Check for a loss of DTC memory.
  2. Disconnect the throttle position sensor.
  3. Run the engine at idle until the MIL comes on.
  4. Turn the ignition OFF.

Is DTC P0122 stored in memory?		 - Go to Step 10. Go to Step 9.
9 Replace the ECM.
Is the repair complete?		 - System OK -
10 Does the vehicle stall while driving? - Go to Step 11. Go to Step 12.
11 Monitor the oxygen sensor and the injector base pulse width with the scan tool.
Does the scan tool display a steady low voltage (about 0 mV) for the oxygen sensor with the control module commanding an injector base pulse width of the value specified?		 8 ms Go to Step 9. Go to Step 12.
12
  1. Check for an open diode across the A/C clutch and for other open diodes.
  2. Repair or replace any components as needed.

Is the repair complete?		 - System OK -
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