P1312
Read the instructions below then
start the fault diagnostic procedure.
Symptom: CHECK ENGINE.
Combustion Detection Cyl. 1+2. Open Circuit / Short to B+.
Fault symptoms
On-Board Diagnostics
Type of diagnosis:
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Continuous. But interrupted when fault criteria fulfilled and will not restart until next driving cycle.
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Enable criteria
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General condition for this diagnostic trouble code: Atmospheric pressure must exceed 72 kPa as well as coolant and intake air temperature must exceed -7°C.
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Engine running. Main relay voltage exceeding 10V. Ignition synchronized.
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Fault criteria
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Voltage exceeding 5V continuously during 200 combustions.
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Dependents
System reaction to a fault
OK report
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Enable criteria fulfilled. Fault criteria for P1312 or P1334 not fulfilled within 300 combustions.
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Fault handling:
(For more information, see
.)
Diagnostic help
Fault diagnosis concerns an electrical fault in the connecting leads.
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Combustion Detection Cyl 1+2 / Bank 1, unit %
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Checking the wiring
Jiggle the wiring harness at several points and in different directions to detect intermittent breaks and short circuits. Observe the multimeter, diagnostic tool or test lamp during the check.
