Diagnostic Aids

A shorted or open solenoid, relay or bulb can cause a Code 26. If only one output circuit is bad, PCM will shut down only that circuit and not entire quad-driver. If any corresponding codes exist (i.e., Code 32, EGR), diagnose that quad-driver first. Component Resistances:

NOTE: The Linear EGR Solenoid and Canister Purge Solenoid resistance values have been updated per Saturn TSB 96-T-08 .

Linear EGR Solenoid 7-10 ohms.
Canister Purge Solenoid 20-50 ohms.
Coolant Fan Relay 70-90 ohms.
A/C Relay 70-90 ohms.

Check circuit No. 817 to passive restraint module for an open or short to ground.

Fig 1: Code 26 Schematic Quad-Driver Error

Fig 2: Code 26 Diagnostic Flow Chart - 1 Of 4 Quad-Driver Error

Fig 3: Code 26 Diagnostic Flow Chart - 2 Of 4 Quad-Driver Error

Fig 4: Code 26 Diagnostic Flow Chart - 3 Of 4 Quad-Driver Error

Fig 5: Code 26 Diagnostic Flow Chart - 4 Of 4 Quad-Driver Error