B1493

DTC B1493 Generator F - Term High:

CIRCUIT DESCRIPTION
This DTC determines if a fault exists that renders the generator F-terminal continuously HIGH.

CONDITIONS FOR SETTING THE DTC
All of the following conditions must be met:
^ The engine is running.
^ The Powertrain Control Module (PCM) is sending the engine-RPM-is-zero Class 2 Serial Data message.
^ The powertrain control module (PCM) is sending the class 2 serial data message indicating that the generator PWM is not less than 64% duty cycle for 30 seconds.

ACTION TAKEN WHEN THE DTC SETS
^ The instrument cluster stores DTC B1493 in memory.
^ The volts indicator will illuminate.

CONDITIONS FOR CLEARING THE DTC
^ The instrument cluster goes to sleep. The controller reinitializes with the fault cleared.
^ All instrument cluster history codes will be cleared after 100 ignition cycles (from OFF to RUN) with no current codes active during the 100 ignition cycles.
^ Use the scan tool.

DIAGNOSTIC AIDS
^ When the diagnostics direct you to take electrical measurements at the terminal assignments of the Wiring Harness Junction Blocks, refer to Power Distribution. This measurement is for terminal assignments of the Wiring Harness Junction Blocks. Power and Ground Distribution
^ If the DTC is a history DTC, the problem may be intermittent. Perform the tests shown while wiggling the wiring and connectors. This may often cause the malfunction to appear.

An intermittent may be caused by any of the following conditions:
^ A poor connection
^ Wire insulation that has been rubbed through
^ A broken wire inside the insulation

Inspect for a poor connection of a damaged harness. Inspect all of the harnesses and connectors for the following conditions:
^ Improper mating
^ Broken locks
^ Improperly formed or damaged terminals
^ Poor terminal-to-wire connections
^ Damaged harnesses

TEST DESCRIPTION
The numbers listed below refer to the numbers on the diagnostic table.
2. This step determines if the Powertrain Control Module (PCM) is reading a false generator PWM input.
3. This step determines if the Powertrain Control Module (PCM) is reading a high generator PWM measurement.
5. This step determines if CKT 23 has a short to B+ condition.