Diagnostic Code Charts

Fig 1: Code 2 - Open Isolation Valve Ckt. Wiring Schematic

Courtesy of ISUZU MOTOR CO.

Fig 2: Code 2 - Open Isolation Valve Ckt. Or Malfunctioning ECM Flowchart (1 Of 2)

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Fig 3: Code 2 - Open Isolation Valve Ckt. Or Malfunctioning ECM Flowchart (2 Of 2)

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Fig 4: Code 3 - Open Dump Valve Ckt. Or Malfunctioning ECM Schematic

Courtesy of ISUZU MOTOR CO.

Fig 5: Code 3 - Open Dump Valve Ckt. Or Malfunctioning ECM Flowchart

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Fig 6: Code 4 - Closed Anti-Lock Valve Switch Schematic

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Fig 7: Code 4 - Closed Anti-Lock Valve Switch Flowchart (1 Of 2)

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Fig 8: Code 4 - Closed Anti-Lock Valve Switch Flowchart (2 Of 2)

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Fig 9: Code 5 - System Operates Dump Valve Excessively Wiring Schematic

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Fig 10: Code 5 - System Operates Dump Valve Excessively Flowchart

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Fig 11: Code 6 - Erratic Speed Sensor Signal Wiring Schematic

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Fig 12: Code 6 - Erratic Speed Sensor Signal Flowchart (1 Of 2)

Courtesy of ISUZU MOTOR CO.

Fig 13: Code 6 - Erratic Speed Sensor Signal Flowchart (2 Of 2)

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Fig 14: Code 7 - Isolation Valve Output Signal Missing Or Defective Anti-Lock Valve Wiring Schematic

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Fig 15: Code 7 - Isolation Valve Output Signal Missing Or Defective Anti-Lock Valve Wiring Flowchart

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Fig 16: Code 8 - Dump Valve Output Signal Missing Or Defective Anti-Lock Valve Wiring Schematic

Courtesy of ISUZU MOTOR CO.

Fig 17: Code 8 - Dump Valve Output Signal Missing Or Defective Anti-Lock Valve Wiring Flowchart

Courtesy of ISUZU MOTOR CO.

Fig 18: Code 9 - Speed Sensor (High Resistance) Wiring Schematic

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Fig 19: Code 9 - Speed Sensor (High Resistance) Flowchart

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Fig 20: Code 10 - Speed Sensor (Low Resistance) Wiring Schematic

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Fig 21: Code 10 - Speed Sensor (Low Resistance) Flowchart(1 Of 2)

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Fig 22: Code 10 - Speed Sensor (Low Resistance) Flowchart(2 Of 2)

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Fig 23: Code 11 - Defective Brakelight Switch Ckt. Flowchart

Courtesy of ISUZU MOTOR CO.