Pinpoint Test A: DTCs B1317 and B1318
Anti-Lock Control
Pinpoint Tests
Pinpoint Test A: DTCs B1317 and B1318
Refer to Wiring Diagram Set 42, Vehicle Dynamic Systems for schematic and connector information. Diagrams By Number
Normal Operation
The operating voltage required for the ABS module, hydraulic pump and isolation valves is in a range between 10 and 16 volts.
Fused battery voltage for hydraulic pump motor operation is supplied to the ABS module by Battery Junction Box (BJB) fuse 12 (30A) along circuit 30-CF13 (RD). Fused battery voltage for hydraulic valve operation is supplied to the ABS module by BJB fuse 15 (20A) along circuit 30-CF6 (RD). Fused ignition voltage for ABS module operation is provided by Central Junction Box (CJB) fuse 161 (7.5A) along circuit 15-CF6 (GN/YE). Ground for all ABS operations is provided along circuit 91-CF13 (BK/BU).
- DTC B1317 (Battery Voltage High) - If, during normal operation or the on-demand self test, the ABS module detects more than 16 volts on the power supply circuits, DTC B1676 will be set.
- DTC B1318 (Battery Voltage Low) - If, during normal operation or the on-demand self test, the ABS module detects less than 10 volts on the power supply circuits, DTC B1676 will be set.
This pinpoint test is intended to diagnose the following:
- Charging system
- Battery
- Wiring, terminals or connectors
- ABS module
PINPOINT TEST A: DTCs B1317 and B1318
NOTICE: Use the Flex Probe Kit for all test connections to prevent damage to the wiring terminals. Do not use standard multi-meter probes.
NOTE: DTC B1317 or B1318 can be set if the vehicle has been recently jump started, the battery has been recently charged or the battery has been discharged. The battery may become discharged due to excessive load(s) on the charging system from aftermarket accessories or if the battery has been left unattended with the accessories on.
NOTE: Carry out a thorough inspection and verification before proceeding with the pinpoint test. Refer to Inspection and Verification. Inspection and Verification
NOTE: This vehicle has an in-line test connector C126 which may make circuit testing easier in certain situations.
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A1 RETRIEVE ALL CMDTCs IN ALL MODULES
- Ignition ON.
- Enter the following diagnostic mode on the scan tool: Self Test - All CMDTCs.
- Is DTC B1317, B1318 or B1676 present in one or more modules AND DTC P0563, P0620, P0625, P0626 or P065B present in the PCM?
Yes
REFER to Charging System Testing and Inspection for diagnosis of the battery and charging system.
No
GO to A2.
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A2 CHECK BATTERY CONDITION
- Ignition OFF.
- Refer to Battery, Mounting and Cables Testing and Inspection and carry out Pinpoint Test A: Battery Condition Test.
- Does the battery pass the condition test?
Yes
If the battery passed the condition test, but required a recharge, REFER to Charging System Testing and Inspection to diagnose the charging system. CLEAR the DTCs. REPEAT the self-test.
If the battery passed the condition test and did not require a recharge, GO to A3.
No
INSTALL a new battery. REFER to Battery, Mounting and Cables Battery. CLEAR the DTCs. REPEAT the self-test.
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A3 CHECK CHARGING SYSTEM VOLTAGE
NOTE: Do not allow the engine speed to increase above 2,000 rpm while performing this step or the generator may self excite and result in default charging system output voltage. If engine speed goes above 2,000 rpm, shut the vehicle OFF and restart the engine before performing this step.
- Start the engine.
- Measure the voltage of the battery with and without a load on the charging system as follows:
- Turn off all accessories and run the engine at 1,500 rpm for a minimum of 2 minutes while measuring battery voltage.
- Turn on headlights and HVAC fan on high and run engine at 1,500 rpm for a minimum of 2 minutes while measuring battery voltage.
- Are the voltages between 13 and 15.2 volts?
Yes
GO to A4.
No
REFER to Charging System Testing and Inspection to diagnose the charging system. CLEAR the DTCs. REPEAT the self-test.
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A4 CHECK THE VOLTAGE TO THE ABS MODULE
- Ignition OFF.
- Disconnect: ABS Module C135.
- Ignition ON.
- Measure the voltage between ground and:
- ABS module C135-1, circuit 30-CF6 (RD), harness side.
- ABS module C135-14, circuit 30-CF13 (RD), harness side.
- ABS module C135-20, circuit 15-CF6 (GN/YE), harness side.
- Are the voltages greater than 10 volts?
Yes
GO to A5.
No
VERIFY BJB fuse 15 (20A) is OK. If OK, REPAIR circuit 30-CF6 (RD).
VERIFY CJB fuse 161 (7.5A) is OK. If OK, REPAIR circuit 15-CF6 (GN/YE).
VERIFY BJB fuse 12 (30A) is OK. If OK, REPAIR circuit 30-CF13 (RD).
CLEAR the DTCs. REPEAT the self-test.
If any fuse is not OK, REFER to the Wiring Diagrams to identify the possible causes of the circuit short. Diagrams By Number
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A5 CHECK THE ABS MODULE GROUND CIRCUIT FOR AN OPEN
- Ignition OFF.
- Measure the resistance between ABS module C135-26, circuit 91-CF13 (BK/BU), harness side and ground.
- Is the resistance less than 5 ohms?
Yes
GO to A6.
No
REPAIR circuit 91-CF13 (BK/BU). CLEAR the DTC. REPEAT the self-test.
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A6 CHECK FOR CORRECT ABS MODULE OPERATION
- Disconnect: In-line Connector C126.
- Check ABS module C135 and in-line connector C126 for:
- corrosion.
- pushed-out pins.
- spread terminals.
- Connect: In-line Connector C126.
- Connect: ABS Module C135.
- Make sure the connectors seat correctly, then operate the system and verify the concern is still present.
- Is the concern still present?
Yes
INSTALL a new ABS module. REFER to Anti-Lock Brake System (ABS) Module Service and Repair. CLEAR the DTCs. REPEAT the self-test.
No
The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the self-test.
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