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 MANUALSJEEP1991CHEROKEE 2WD L4-150 2.5L VIN P MFIREPAIR AND DIAGNOSISCRUISE CONTROLTESTING AND INSPECTIONSCAN TOOL TESTING AND PROCEDURESDRBII TEST FUNCTIONS
1991 Jeep Cherokee 2WD L4-150 2.5L VIN P MFI
DRBII Test Functions
1991 Jeep Cherokee 2WD L4-150 2.5L VIN P MFISECTION DRBII Test Functions
This section contains diagnostic tests for the speed control and charging Systems.
In order to perform the tests, you must operate the DRBII to reach the SPEED CONTROL MENU or CHARGING MENU level within the diagnostic testing program. See HELP - 1 Operation of the DRBII for Diagnostic Testing for assistance. At the SPEED CONTROL MENU or CHARGING MENU level, you can read DRBII faults and perform diagnostic test functions.
The SPEED CONTROL MENU or CHARGING MENU provides a choice of several different categories of test functions as described below.
System Tests - This function is not available in the engine controller diagnostics program.
Read Faults - This function enables the Technician to read faults and erase faults.
State Display - This function enables the Technician to activate the speed control servo or the charging system alternator.
Actuator Tests - This function enables the Technician to erase all faults after they have been read.
Adjustments - This function enables the Technician to erase faults after they have been read.
In order to perform the tests, you must operate the DRBII to reach the SPEED CONTROL MENU or CHARGING MENU level within the diagnostic testing program. See HELP - 1 Operation of the DRBII for Diagnostic Testing for assistance. At the SPEED CONTROL MENU or CHARGING MENU level, you can read DRBII faults and perform diagnostic test functions.
The SPEED CONTROL MENU or CHARGING MENU provides a choice of several different categories of test functions as described below.
System Tests - This function is not available in the engine controller diagnostics program.
Read Faults - This function enables the Technician to read faults and erase faults.
State Display - This function enables the Technician to activate the speed control servo or the charging system alternator.
Actuator Tests - This function enables the Technician to erase all faults after they have been read.
Adjustments - This function enables the Technician to erase faults after they have been read.
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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.