Specifications

F156
ON-BOARD DIAGNOSTIC
DTC P0703
A6E397001089W01
Diagnostic procedure
DTC P0703 Brake switch input malfunction
DETECTION
CONDITION
• PCM monitors changes in input voltage from brake switch. If PCM does not detect PCM terminal 1K
voltage changes while alternately accelerating and decelerating 8 times, PCM determines that neutral
switch circuit has malfunction.
Diagnostic support note
• This is a continuous monitor (CCM).
• MIL illuminates if PCM detects the above malfunction condition in two consecutive drive cycles or in one
drive cycle while the DTC for the same malfunction has been stored in the PCM.
• PENDING CODE is available if PCM detects the above malfunction condition during first drive cycle.
• FREEZE FRAME DATA is available.
• DTC is stored in PCM memory.
POSSIBLE
CAUSE
• Brake switch malfunction
• Poor connection of brake switch connector or PCM connector.
• Short to power between brake switch terminal D and PCM connector terminal 1K.
• Open harness between brake switch terminal D and PCM connector terminal 1K.
• Open harness between battery positive terminal and brake switch terminal B.
• PCM malfunction
STEP INSPECTION ACTION
1 VERIFY FREEZE FRAME DATA HAS BEEN
RECORDED
• Has FREEZE FRAME DATA been recorded?
Yes Go to next step.
No Record FREEZE FRAME DATA on repair order, then go to
next step.
2 VERIFY RELATED SERVICE INFORMATION
AVAILABILITY
• Check for related Service Information
availability.
• Is any related Service Information available?
Yes Perform repair or diagnosis according to available Service
Information.
• If vehicle is not repaired, go to next step.
No Go to next step.
3 CLASSIFY HIGH INPUT OR LOW INPUT
• Connect WDS or equivalent to DLC-2.
• Access BOO PID.
• Verify BOO PID during brake pedal operation.
• Is BOO PID always OFF?
Yes Go to Next step.
No Go to Step 10.