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.
SYS.OK|MANUAL.DB● LIVE
HOMESERVICE MANUALSCADILLAC1991FLEETWOOD FWD V8-300 4.9LREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSTESTING AND INSPECTIONCOMPONENT TESTS AND GENERAL DIAGNOSTICSINPUT SWITCH TEST FAILURE DIAGNOSTIC TESTSINPUT E.7.8 - POWER STEERING PRESSURE SWITCH
1991 Cadillac Fleetwood FWD V8-300 4.9L
Input E.7.8 - Power Steering Pressure Switch
1991 Cadillac Fleetwood FWD V8-300 4.9LSECTION Input E.7.8 - Power Steering Pressure Switch
Switch Test E.7.8:
Power Steering Switch Circuit:
DISPLAY CONFIGURATION:
After .7.0 is displayed on the Fuel Data Center (FDC), the PCM/ECM switch test can be initiated by depressing the brake pedal when the brake pedal has been depressed the FDC will display E.7.0. AT this time the HI and LO buttons on the Electronic Climate Control (ECC) panel can be used to select the specific switch test. When a specific test has been selected and that switch activated, the display will alternately display the code for that test and E.0.0 to confirm the switch is working.
TEST DESCRIPTION:
This test detects the open and close of the power steering switch located on the steering gear at terminal C9 of the PCM/ECM.
NOTE: The engine must be running and the steering wheel turned to the full left to perform this test.
RENDER: 1.0x
NO RELATED
Recommended Tools & Savings
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Affiliate disclosure: We may earn a commission at no extra cost to you.
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.