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Home >> Mazda >> 2008 >> B4000 Base, Automatic >> Repair and Diagnosis >> Accessories & Equipment >> Gauges & Instrument Panels >> Troubleshooting (Instrumentation/Driver Information) >> Pinpoint Test 26: The OVERTEMPERATURE Warning Indicator Is Never/Always On >> Normal Operation

Normal Operation

The over temperature status is sent from the powertrain control module (PCM) to the instrument cluster over the high speed controller area network (HS-CAN) communication bus. During an engine overheat condition, the PCM enters into the failsafe mode and sends a signal to the instrument cluster to turn on the over temperature warning indicator. During a failsafe mode the instrument cluster also sends the temperature gauge pointer to hot (H), or the highest position on the gauge to alert the driver of the overheat condition. The instrument cluster sets DTC U0100 in continuous memory if the over temperature status message is missing for more than 5 seconds and the instrument cluster turns off the failsafe warning indicator.

This pinpoint test is intended to diagnose the following: 

TEMPERATURE WARNING INDICATOR PINPOINT TEST 27

PINPOINT TEST 27 THE OVER TEMPERATURE WARNING INDICATOR IS NEVER/ALWAYS ON
STEP INSPECTION ACTION
1 RETRIEVE THE RECORDED DTCs FROM BOTH THE CONTINUOUS AND ON-DEMAND PCM SELF-TESTS
  • Retrieve the recorded DTCs from the PCM continuous and on-demand self-tests.
  • Are any DTCs retrieved? 
 Yes See DIAGNOSTIC TROUBLE CODE (DTC) INDEX - POWERTRAIN CONTROL MODULE (PCM) .
No Go to next step.
2 RETRIEVE THE RECORDED DTCs FROM BOTH THE CONTINUOUS AND ON-DEMAND INSTRUMENT CLUSTER SELF-TESTS
  • Retrieve the recorded DTCs from the instrument cluster continuous and on-demand self-tests.
  • Is DTC U0100 retrieved? 
 Yes Go to INSTRUMENT CLUSTER DIAGNOSTIC TROUBLE CODE (DTC) INDEX  .
No Go to next step.
3 CARRY OUT THE INSTRUMENT CLUSTER INDICATOR LAMP COMMAND USING THE SCAN TOOL
  • Key in ON position.
  • Enter the following diagnostic mode on the scan tool:
    • Instrument Cluster DataLogger
  • Select the instrument cluster over temperature indicator (OVTEMPJ-MP) active command. Command over temperature warning indicator on then off. Observe the over temperature warning indicator.
  • Does the over temperature warning indicator turn on when commanded on and turn off when commanded off? 
 Yes Go to next step.
No Go to step 5.
4 CHECK FOR CORRECT PCM OPERATION
  • Disconnect all the PCM connectors.
  • Check for:
    • corrosion
    • damaged pins
    • pushed-out pins
  • Connect the all the PCM connector and make sure they seat correctly.
  • Operate the system and verify the concern is still present.
  • Is the concern still present? 
 Yes INSTALL a new PCM. See POWERTRAIN CONTROL MODULE (PCM) REMOVAL / INSTALLATION . 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.
5 CHECK FOR CORRECT INSTRUMENT CLUSTER OPERATION
  • Disconnect all instrument cluster connectors.
  • Check for:
    • corrosion
    • damaged pins
    • pushed-out pins
  • Connect all instrument cluster connectors and make sure they seat correctly.
  • Operate the system and verify the concern is still present.
  • Is the concern still present? 
 Yes INSTALL a new instrument cluster. See INSTRUMENT CLUSTER . 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.
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