Engine Controls - DTC P0606/P0689/P1516/P1682 /P2176
TSB # IB07-04-S001Issue Date: APRIL 2007
Subject:
Diagnostic Information For 5.3L Engines For Diagnostic Trouble Codes (DTCs) P0606, P0689, P1516, P1682 And/Or P2176 That May have Set Due To Low Battery Voltage Condition
Affected Vehicles
2005-2006 Isuzu Ascender with 5.3L Engine
Service Information
This bulletin is being published to aid technicians in the diagnosis of the following DTCs:
^ P0606 -- Control Module Internal Performance
^ P0689 -- Engine Controls Ignition Relay Feedback Circuit Low Voltage
^ P1516 -- Throttle Actuator Control (TAC) Module Actuator Position Performance
^ P1682 -- Ignition 1 Switch Circuit 2
^ P2176 -- Minimum Throttle Position Not Learned
The above DTCs may have set under a low battery voltage condition during or prior to vehicle cranking then starting. If these codes are present and a low battery condition exists or the customer indicates that the vehicle has experienced a low battery voltage condition the technician should do the following:
1. With a Tech2 observe the engine RPM and the control module voltage in freeze frame and failure records for the DTC(s) set. If the engine RPM is zero or lower than idle speed and the control module voltage indicates less than 9 volts this may indicate a low battery condition had occurred to cause these codes to set. The low battery condition should be diagnosed and corrected. Refer to the Service Manual for Battery Inspection/Test and/or Charging System Test.
2. If the battery voltage is within the normal operating range refer to the DTC(s) set in the Service Manual for further diagnosis.
3. After the low voltage concern has been identified and addressed clear the codes. Do Not replace the ECM for this concern.
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