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Home >> Land Rover >> 2000 >> Range Rover Base >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics - With Codes >> Diagnostic Tests (BOSCH) >> DTC P0130, P0131, P0132, P0133, P0136, P0135, P0136, P0137, P0138, P0140, P0141, P0150, P0151, P0152, P0153, P0156, P0157, P0158, P0160, P161, P1129, P1170, P1173: Ho2S Circuit Malfunction >> Diagnosis & Repair

Diagnosis & Repair

  1. Check for contaminated sensor, poor connections, loose terminals, and open or shorted wires. Ensure wiring to front sensors is not crossed. See appropriate wiring diagram in WIRING DIAGRAMS article. See Figure, Figure, Fig 1 and Fig 2 . Perform repairs as necessary. When repairs are completed, go to step  3.
  2. Start engine and allow to operate at normal operating temperature. Backprobe specified ECM C0635 connector terminals for suspect HO2S and check signal values. HO2S voltage is difficult to measure using a DVOM, HO2S output can be monitored using a Land Rover TestBook, an OBD-II scan tool or an oscilloscope. A rich mixture should read 500-1000 mV, a lean mixture should read 100-500 mV, and the reading should switch from rich to lean and back. The ECM open loop default voltage is 450 mV, this is used to set the air/fuel ratio until the HO2S reaches operating temperature. Perform repairs as necessary. When repairs are completed, go to next step.
  3. When HO2S related DTC repairs are completed, perform specified REPAIR CONFIRMATION DRIVE CYCLE. See DIAGNOSTIC TROUBLE CODE (DTC) IDENTIFICATION (BOSCH) table in SELF-DIAGNOSTICS - INTRODUCTION article.
IDENTIFYING ECM C0635 CONNECTOR HO2S TERMINALS

ECM C0635 Connector Terminal Function Signal Type Signal Value
1 Right Rear HO2S Heater Drive Signal 0-12 Volt PWM
7 Left Rear HO2S Heater Drive Signal 0-12 Volt PWM
8 Right Rear HO2S Sensor Ground Signal Zero Volts
9 Left Front HO2S Sensor Ground Signal Zero Volts
10 Right Front HO2S Sensor Ground Signal Zero Volts
11 Left Rear HO2S Sensor Ground Signal Zero Volts
13 Right Front HO2S Heater Drive Signal 0-12 Volt PWM
14 Right Rear HO2S Sensor Input Signal 0-1 Volt Analog
15 Left Front HO2S Sensor Input Signal 0-1 Volt Analog
16 Right Front HO2S Sensor Input Signal 0-1 Volt Analog
17 Left Rear HO2S Sensor Input Signal 0-1 Volt Analog
19 Left Front HO2S Heater Drive Signal 0-12 Volt PWM
Fig 1: Identifying Front HO2S 4-Pin (Orange) Connector Terminals
G99C52656Courtesy of LAND ROVER NORTH AMERICA, INC.
Fig 2: Identifying Rear HO2S 4-Pin (Gray) Connector Terminals
G99D52657Courtesy of LAND ROVER NORTH AMERICA, INC.
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