Pinpoint Test A: Adjustable Brake Pedal Is Inoperative/Does Not Operate Correctly (System Without Memory Feature)
Pinpoint Tests
Pinpoint Test A: Adjustable Brake Pedal is Inoperative/Does Not Operate Correctly (System Without Memory Feature)
Refer to Wiring Diagram Set 127, Adjustable Pedals for schematic and connector information. Diagrams By Number
Normal Operation
The adjustable pedal switch receives fused battery voltage from Smart Junction Box (SJB) fuse 27 (20A) along circuit SBP27 (BU/RD).
When the adjustable pedal switch is placed in the forward position, voltage is sent to the adjustable pedal motor along circuit CPP09 (VT/OG), passes through the motor and returns to the switch along circuit CPP10 (BN/BU) where it is grounded along circuit GD111 (BK/BU). This causes the pedal to move forward (away from the driver).
When the adjustable pedal switch is placed in the forward position, voltage is sent to the adjustable pedal motor along circuit CPP10 (BN/BU), passes through the motor and returns to the switch along circuit CPP09 (VT/OG) where it is grounded along circuit GD111 (BK/BU). This causes the pedal to move rearward (toward the driver).
This pinpoint test is intended to diagnose the following:
- Foreign material
- Fuse
- Wiring, terminals or connectors
- Adjustable pedal cable
- Adjustable pedal switch
- Adjustable pedal motor
PINPOINT TEST A: ADJUSTABLE BRAKE PEDAL IS INOPERATIVE/DOES NOT OPERATE CORRECTLY (SYSTEM WITHOUT MEMORY FEATURE)
NOTICE: Use the Flex Probe Kit for all test connections to prevent damage to the wiring terminals. Do not use standard multi-meter probes.
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A1 INSPECT THE SYSTEM FOR FOREIGN MATERIAL
- Inspect the adjustable brake pedal assembly for foreign material causing a binding condition.
- Is the brake pedal assembly free of foreign material?
Yes
GO to A2.
No
REMOVE the foreign material. TEST the system for normal operation.
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A2 ISOLATE THE ADJUSTABLE BRAKE PEDAL
- Disconnect the adjustable brake pedal cable from the adjustable brake pedal.
- Operate the adjustable pedal control switch.
- Does the adjustable accelerator pedal move according to switch position?
Yes
GO to A3.
No
GO to A5.
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A3 CHECK THE ADJUSTABLE BRAKE PEDAL CABLE OPERATION
- Operate the adjustable pedal control switch.
- Does the adjustable brake pedal cable spin in the conduit when the switch is operated?
Yes
GO to A4.
No
INSTALL a new adjustable brake pedal motor cable. TEST the system for normal operation.
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A4 CHECK THE CABLE
- Disconnect the adjustable brake pedal cable from the adjustable pedal motor.
- Inspect the ends of the brake pedal motor cable for wear or damage.
- Are the cable ends OK?
Yes
INSTALL a new adjustable brake pedal and bracket. REFER to Brake Pedal and Bracket - Adjustable Service and Repair. TEST the system for normal operation.
No
INSTALL a new brake pedal motor cable. TEST the system for normal operation.
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A5 TEST THE ADJUSTABLE PEDAL SWITCH
- Ignition OFF.
- Disconnect: Adjustable Pedal Switch C2235.
- Test the adjustable pedal switch.
- Does the adjustable pedal switch pass the test?
Yes
GO to A6.
No
INSTALL a new adjustable pedal switch. TEST the system for normal operation.
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A6 CHECK FOR VOLTAGE TO THE ADJUSTABLE PEDAL SWITCH
- Measure the voltage between adjustable pedal switch C2235-2, circuit SBP27 (BU/RD), harness side and ground.
- Is the voltage greater than 10 volts?
Yes
GO to A7.
No
VERIFY SJB fuse 27 (20A) is OK. If OK, REPAIR circuit SBP27 (BU/RD). If not OK, Refer to the Wiring Diagrams to identify the cause of the circuit short. TEST the system for normal operation.
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A7 CHECK THE GROUND CIRCUITS FOR AN OPEN
- Measure the resistance between ground and:
- adjustable pedal switch C2235-3, circuit GD111 (BK/BU), harness side.
- adjustable pedal switch C2235-6, circuit GD111 (BK/BU), harness side.
- Are the resistances less than 5 ohms?
Yes
GO to A8.
No
REPAIR circuit GD111 (BK/BU). TEST the system for normal operation.
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A8 CHECK THE ADJUSTABLE PEDAL MOTOR CIRCUITS FOR AN OPEN
- Disconnect: Adjustable Pedal Motor C2159.
- Measure the resistance between adjustable pedal switch C2235-1, circuit CPP10 (BN/BU), harness side and adjustable pedal motor C2159-1, circuit CPP10 (BN/BU), harness side.
- Measure the resistance between adjustable pedal switch C2235-7, circuit CPP09 (VT/OG), harness side and adjustable pedal motor C2159-2, circuit CPP09 (VT/OG), harness side.
- Is the resistance less than 5 ohms?
Yes
GO to A9.
No
REPAIR the affected circuit(s). TEST the system for normal operation.
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A9 CHECK THE ADJUSTABLE PEDAL MOTOR CIRCUITS FOR A SHORT TO GROUND
- Measure the resistance between ground and:
- adjustable pedal switch C2235-7, circuit CPP09 (VT/OG), harness side.
- adjustable pedal switch C2235-1, circuit CPP10 (BN/BU), harness side.
- Are the resistances greater than 10,000 ohms?
Yes
INSTALL a new adjustable brake pedal and bracket assembly. REFER to Brake Pedal and Bracket - Adjustable Service and Repair. TEST the system for normal operation.
No
REPAIR the affected circuit(s). TEST the system for normal operation.
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