Mazda 626 Station Wagon, Workshop Manual

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ON-BOARD DIAGNOSTIC
DTC P0122
Except for GF4A-EL Models
DTC P0122 TP circuit low Input
DETECTION
CONDITION
If PCM detects TP sensor voltage at PCM terminal 89 is below 0.1 V after engine start, PCM
determines that TP circuit has a malfunction.
POSSIBLE
CAUSE
TP sensor malfunction
Connector or terminal malfunction
Open circuit between TP sensor terminal B and PCM terminal 89
Short to ground circuit between TP sensor terminal B and PCM terminal 89
Open circuit between TP sensor terminal A and PCM terminal 90
Short to ground circuit between TP sensor terminal A and PCM terminal 90
PCM malfunction
T P SENSOR
- 0
- ©
» -
PCM
T
B -
7 ? 7 *
T P SE N SO R
HA RNESS SID E C O NNECTO R
(VIEW FRO M TER M IN A L SIDE)
PCM
1
1
I I I I I I I I I I
I
I I I I I I I I I I I I I
-|~T " r I I I I I r i
i I I i I I I I 1.1.'1.1
m r i ri r r n i
«
89 90 91
HARNESS SIDE C O N N E C TO R
(VIEW FROM TER M IN A L SIDE)
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
repair information.
• If vehicle is not repaired, go to next step.
No Go to next step.
2 VERIFY CURRENT INPUT SIGNAL STATUS -
IS CONCERN INTERMITTENT OR CONSTANT
• Turn ignition key to ON (Engine OFF).
• Access TP V PID using NGS tester.
• Check TP V PID while gradually depressing
accelerator pedal.
• Is TP V PID below 0.1 V?
Yes Go to next step.
No Intermittent concern exists. Go to INTERMITTENT
CONCERN TROUBLESHOOTING procedure.
(See F1-142 No.26 INTERMITTENT CONCERNS)
F1-53