Pinpoint Test W: The OVERTEMP Warning Indicator Is Inoperative

WARNING: This page is about a different car, the 2006 Mercury Mariner and 2006 Ford Escape. However, it is still accessible from the selected car via links, so may be relevant.

W1 CHECK THE RECORDED DTCs FROM BOTH CONTINUOUS AND ON-DEMAND POWERTRAIN CONTROL MODULE (PCM) SELF-TESTS
- Check the PCM DTCs from the continuous and on-demand self-tests.
- Are any PCM DTCs recorded?
Yes : REFER to the INTRODUCTION -- HYBRID ESCAPE & HYBRID MARINER article to continue diagnosis of the DTCs.

No : GO to W2.
W2 CARRY OUT THE INSTRUMENT CLUSTER PROVE-OUT
- Carry out the instrument cluster self-diagnostic test for the bulb check.
- Observe the overtemp warning indicator.
- Does the overtemp warning indicator illuminate?
Yes : GO to W4.

No : GO to W3.
W3 CHECK FOR CORRECT INSTRUMENT CLUSTER OPERATION
- Disconnect the instrument cluster connector.
- Check for:
  - corrosion
  - pushed-out pins
- Connect the instrument cluster connector and make sure it seats correctly.
- Operate the system and determine if the concern is still present.
- Is the concern still present?
Yes : INSTALL a new instrument cluster. REFER to INSTRUMENT CLUSTER in this article. TEST the system for normal operation.

No : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.
W4 CHECK FOR CORRECT PCM OPERATION
- Disconnect all the PCM connectors.
- Check for:
  - corrosion
  - pushed-out pins
- Connect all the PCM connectors and make sure they seat correctly.
- Operate the system and determine if the concern is still present.
- Is the concern still present?
Yes : INSTALL a new PCM. REFER to ELECTRONIC ENGINE CONTROLS - HYBRID . TEST the system for normal operation.

No : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.