Mazda 626 - Page 75

ON-BOARD DIAGNOSTIC
STEP INSPECTION ACTION
3 CLASSIFY TP SENSOR OR HARNESS
MALFUNCTION
• Disconnect TP sensor connector.
• Connect jumper wire between TP sensor
terminals A and B (harness-side).
• Check TP V PID.
— TP V PID reading: 4.8 V or above
• Is PID reading okay?
Yes Go to next step.
No Go to Step 5.
4
CHECK TP SENSOR CIRCUIT FOR OPEN
• Turn ignition key to OFF.
• Check for continuity between TP sensor
terminals A and B (part-side).
• Is there continuity?
Yes
Check TP sensor connector terminal A for poor
connection. Repair or replace as necessary, then go
to Step 11.
No Replace TP sensor, then go to Step 8.
5
CHECK POWER SUPPLY CIRCUIT VOLTAGE
AT TP SENSOR CONNECTOR
• Turn ignition key to ON (Engine OFF).
• Check voltage at TP sensor terminal A
(harness-side).
• Is voltage within 4.5—5.5 V?
Yes
Go to next step.
No
Repair or replace open circuit in wiring harness
between TP sensor terminal A (harness-side) and
PCM terminal 90 (harness-side), then go to Step 8.
6
VERIFY TP SIGNAL CIRCUIT FOR OPEN
• Turn ignition key to OFF.
• Disconnect PCM connector.
• Connect breakout box with PCM
disconnected.
• Disconnect TP sensor connector.
• Check for continuity between TP sensor
terminal C (harness-side) and breakout box
terminal 89.
• Is there continuity?
Yes Go to next step.
No
Repair or replace suspected harness, then go to Step
8.
7 VERIFY TP SIGNAL CIRCUIT FOR SHORT TO
GROUND
• Check for continuity between TP sensor
connector terminal C and body ground.
• Is there continuity?
Yes
Repair or replace suspected harness, then go to Step
8.
No
Go to next step.
8 VERIFY TROUBLESHOOTING OF DTC P0122
COMPLETED
• Make sure to reconnect all disconnected
connectors.
• Start engine.
• Clear DTC from PCM memory using NGS
tester generic OBD-II function.
• Access TP V PID using NGS tester.
• Verify TP V PID is within 0.1—4.8
V.
• 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 there any DTCs present?
Yes
Go to applicable DTC inspection.
(See F1-37 DTC TABLE)
No
Troubleshooting completed.
F1-54