B1487

DTC B1487 Generator L - Term Low W/Engine Running:

CIRCUIT DESCRIPTION
This DTC determines if a fault exists that renders the generator L-terminal continuously LOW with the engine running.

CONDITIONS FOR SETTING THE DTC
All of the following conditions must be met:
^ The vehicle is running.
^ The Powertrain Control Module (PCM) does not send the L-terminal-HIGH Class 2 serial data message for 30 seconds after the vehicle has started.

ACTION TAKEN WHEN THE DTC SETS
^ The Instrument Cluster stores DTC B1487 in memory.
^ The volts indicator will illuminate.

CONDITIONS FOR CLEARING THE DTC
^ 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.
^ The instrument cluster goes to sleep. The cluster reinitializes with the fault cleared.
^ 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 225 circuit has a B+ voltage applied
3. This step determines if CKT 225 has a short to ground condition.
4. This step determines if CKT 225 has a open circuit condition.
5. This step determines if the Powertrain Control Module (PCM) is reading the L-terminal status properly.