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HOMESERVICE MANUALSSATURN1992SL1 AUTOMATICREPAIR AND DIAGNOSISTRANSMISSIONAUTOMATIC TRANSDIAGNOSIS - A/TDIAGNOSTIC FLOW CHARTS (CARS)CODE 26, QUAD-DRIVER CIRCUIT 3.8L W BODYHOT LIGHT DIAGNOSIS
1992 Saturn SL1 Automatic

Hot Light Diagnosis

1992 Saturn SL1 AutomaticSECTION Hot Light Diagnosis
NOTE: These checks assume vehicle is not overheating. Verify proper operation of cooling system prior to diagnosing hot light.

Hot light is powered by the 10-amp INDIC fuse. Light will turn on when ECM provides a ground for the circuit. If circuit grounds between light and ECM, light will illuminate any time the ignition is turned on.

  1. Turn ignition on with engine off (bulb test position). If hot light illuminates, go to step 3. If hot light does not illuminate, check the following:
    • 10-amp INDIC fuse
    • Faulty instrument cluster bulb
    • Open circuit between fuse and hot light
  2. Backprobe terminal B4 at ECM with a test light to battery voltage. Turn ignition on. If test light does not illuminate. ECM terminal connection is bad or ECM is faulty. If test light illuminates, turn ignition off. Disconnect ECM connectors. Jumper terminal B4 to ground. turn ignition on. If hot light does not illuminate, check for open circuit between hot light and ECM. If light does not illuminate and all circuits are intact and power is available to light, instrument cluster must be replaced.
  3. Start engine. If test light goes off, no problem is evident. See DIAGNOSTIC AIDS. If test light is on, turn ignition off. Disconnect ECM connector. Probe ECM harness terminal B4 with a test light to battery voltage. If light is off, replace ECM. IF light is on, repair short to ground in circuit No. 35. If no short is present, replace instrument cluster.
Fig 1: Code 26 Troubleshooting Flowchart 1 Of 2 (3.8L W Body)
G91F07301Courtesy of GENERAL MOTORS CORP.

A) (3.8L W Body With ECM-Controlled Temp Light) This determines which circuit is out of specification.

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.