Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSSATURN1996SW1 L4-1.9L SOHC VIN 8REPAIR AND DIAGNOSISA L L DIAGNOSTIC TROUBLE CODES ( DTC )TESTING AND INSPECTIONP CODE CHARTSP1691
1996 Saturn SW1 L4-1.9L SOHC VIN 8
P1691
1996 Saturn SW1 L4-1.9L SOHC VIN 8SECTION P1691
Diagnostic Chart:
Wiring Diagram:
The coolant temperature gage is directly controlled by the PCM using a pulse width modulated (PWM) signal, based on information from the engine coolant temperature (ECT) sensor. The PCM uses the inputs from the ECT to control fuel, the A/C cooling fan and the low coolant/hot lamp. The ECT is the only coolant temperature sensing device on both SOHC and DOHC engines.
DTC PARAMETERS
DTC P1691 will set if:
^ There is an open, short to ground or short to voltage in the coolant gage circuit.
NOTE: The coolant gage circuit is continuously checked when the ignition is On.
DIAGNOSTIC AIDS
When attempting to diagnose an intermittent problem use the Scan tool to review malfunction history diagnostic information. This supplemental data can be used to duplicate a problem. If the Scan tool MALF history indicates an open/short to power or ground, refer to the coolant circuit gage chart.
Intermittents or opens suspected to be at the connector can be detected using diagnostic service probe. Voltage can be read on wires without disconnecting any connectors.
RENDER: 1.0x
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.