BELT TENSION
| Application | Tension In Lbs. (kg) | ||
|---|---|---|---|
| Serpentine Belt | |||
| Cherokee & Wrangler | |||
| New Belt (1) | 180-200 (81.72-90.80) | ||
| Used Belt | 140-160 (63.56-72.64) | ||
| Grand Cherokee | (2) | ||
| (1) Belt is considered new if used less than 15 minutes. (2) Equipped with automatic belt tensioner. | |||
| (1) | Belt is considered new if used less than 15 minutes. |
| (2) | Equipped with automatic belt tensioner. |
BELT ADJUSTMENT
INITIAL CHECKS
Before proceeding with charging system diagnosis, ensure following conditions are met
- Battery is fully charged and in good condition.
- Battery cables are in good condition with connections clean and secure.
- Generator belt is in good condition and properly tightened. See «BELT ADJUSTMENT»(ref-670-S30569443432000031300000) .
- Generator and PCM wiring harness connections are clean and tight.
- Engine ground strap is in place.
UNSTEADY OR LOW CHARGING
Check for loose generator belt, charging resistance too high, loose generator ground wire, corroded battery terminals or faulty generator. See BELT ADJUSTMENT .
OVERCHARGING
Check for grounded generator field wiring or faulty generator. See WIRING DIAGRAMS .
NOISY GENERATOR
Check for worn or frayed drive belt, loose generator mounting, or faulty generator. See TORQUE SPECIFICATIONS table for generator mounting bolt tension.
PRECAUTIONS
Before proceeding with diagnosis, observe following precautions
- Ensure battery is fully charged.
- Probe PCM connector from pin side. DO NOT backprobe PCM connector or probe wires through insulation.
- DO NOT cause short circuits when performing electrical tests. This will set additional DTCs, making diagnosis of original problem more difficult.
- DO NOT use a test light in place of a voltmeter.
- Always begin repair with lowest DTC number (MIL) or first DTC displayed (scan tool).
- Always perform appropriate verification (VER) test after repairs are made.
- Always disconnect scan tool after use.
- Always disconnect scan tool before charging battery.
RETRIEVING DTCS
Note. Self-diagnostic tests are written specifically for Chrysler's Diagnostic Readout Box (DRB-III) scan tool. A generic scan tool may also be used for system diagnostics, but may have limited diagnostic capability.
CLEARING DTCS
PCM automatically clears DTCs from PCM memory after 50 ignition on-off cycles. DTCs can also be cleared using scan tool by following scan tool manufacturer's instructions.
Blank Message Screen
Check for loose cable connections or bad cable. If cable connections and cable are okay, check voltage at DLC terminal No. 16 (Pink/White wire on Wrangler; Pink/Red wire on Grand Cherokee; Tan/Black wire on Cherokee). Voltage should be at least 11 volts. If voltage is not as specified, check wiring circuit and necessary fuses. See WIRING DIAGRAMS .
NO RESPONSE Message
See TEST NS-6A in appropriate SELF-DIAGNOSTICS article in ENGINE PERFORMANCE in the appropriate manual.
Note. For more information on scan tool and PCM diagnostics, see appropriate SELF-DIAGNOSTICS article in ENGINE PERFORMANCE in the appropriate manual.
BATTERY TEMPERATURE SENSOR
Disconnect sensor wiring connector. Sensor is located under the battery. Using an ohmmeter, connect leads to sensor terminals. With ambient temperature of 75-80°F (25°C), reading should be 9000-11,000 ohms. If reading is above or below specification, replace sensor.