Mazda 626 Station Wagon, Workshop Manual

Page: 113 / 577

ON-BOARD DIAGNOSTIC
Diagnostic procedure
STEP INSPECTION ACTION
1 VERIFY RELATED REPAIR 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, then go to next step.
No Go to next step.
2 VERIFY CURRENT INPUT SIGNAL STATUS —
IS CONCERN INTERMITTENT OR CONSTANT
• Connect NGS tester to DLC.
• Start engine.
• Access VS PID using NGS tester.
• Drive vehicle above 5.6 km/h {3.7 mph}.
• Is same DTC present?
Yes Go to next step.
No
Intermittent concern is existing. Go to
INTERMITTENT CONCERN TROUBLESHOOTING
procedure.
(See F1-142 No.26 INTERMITTENT CONCERNS)
3 CHECK FOR POOR CONNECTION OF
ABS/TCS HU/CM CONNECTOR
• Turn ignition key to OFF.
• Disconnect ABS/TCS HU/CM connector.
• Check for poor connection (damaged,
pulled-out terminals, corrosion, etc.).
• Are there any malfunctions?
Yes Repair or replace terminals, then go to Step 8.
No Go to next step.
4 INSPECT COMMUNICATION LINE FOR SHORT
TO POWER
• Turn ignition key to ON (Engine OFF).
• Measure voltage between ABS/TCS HU/CM
terminal L and body ground.
• Is voltage B+
Yes Repair or replace harness for short to ground, then go
to Step 8.
No Go to next step.
5 INSPECT COMMUNICATION LINE FOR SHORT
TO GROUND
• Turn ignition key to OFF.
• Check for continuity between ABS/TCS
HU/CM terminal L and body ground.
• Is there continuity?
Yes Repair or replace harness for short to ground, then go
to Step 8.
No Go to next step.
6 CHECK FOR POOR CONNECTION OF PCM
CONNECTOR
• Disconnect PCM connector.
• Check for poor connection (damaged,
pulled-out terminals, corrosion, etc.).
• Are there any malfunctions?
Yes Repair or replace terminals, then go to Step 8.
No Go to next step.
7 INSPECT ABS/TCS HU/CM
• Inspect ABS/TCS HU/CM.
(See Section P)
• Is ABS/TCS HU/CM okay?
Yes Go to next step.
No Replace ABS/TCS HU/CM, then go to next step.
8 VERIFY TROUBLESHOOTING OF DTC P1627
COMPLETED
• Turn ignition key to ON (Engine OFF).
• Access VS PID using NGS tester.
• Drive vehicle
above 5.6 km/h {3.7 mph}.
• Is same DTC present?
Yes Replace PCM, then go to next step.
No Go to next step.
9 VERIFY AFTER REPAIR PROCEDURE
• Perform “After Repair Procedure.”
(See F1-36 AFrER REPAIR PROCEDURE)
• Are any DTCs present?
Yes Go to applicable DTC inspection
(See F1-37 DTC TABLE)
No Troubleshooting completed.
F 1-92