P1670 , P1671 , P1672
Symptom: Check Engine on.
P1670
Glow Control Unit. Open Circuit / Short to Ground
P1671
Glow Control Unit. Short to B+
P1672
Glow Control Unit. Feedback Error
Fault symptom
Conditions
The following conditions apply for the DTC in question:
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P1670:
The activating circuit (pin 94) is shorting to ground or there is an open circuit. The diagnostic trouble code can be generated only if glow is not activated.
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P1671:
The activating circuit (pin 94) is shorting to B+. The diagnostic trouble code can be generated only if glow is activated.
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P1672:
The diagnostic lead from the glow plug control module should switch high/low inversely to the activating lead from EDC to the glow plug control module. If there is no inversion and the diagnostic lead (pin 87) has the same status (high/low) as the activating lead (pin 94) then the glow plug control module has reported a fault in the glow plug circuit, or there is an electrical fault in the diagnostic lead (pin 87).
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Diagnostic help
Glow can be read and activated with the diagnostic tool.
