Checking negative cable, exhaust
gas temperature sensor
Tools:
88890074 Multimeter
1 NOTICE! Cut the current with the main switch.
2 Disconnect the connector from the sensor
3
Use multimeter 88890074 to do resistance meas-
urement against the engine control unit.
Measurement points Nominal value
1 — Battery negative R ≈ 0 Ω
Checking exhaust gas temperature
sensor
Tools:
88890074 Multimeter
1 NOTICE! Cut the current with the main switch.
2 Remove the
connector from the sensor and remove
the sensor from exhaust bend to check that the
sensor has no visible damage.
3 Use multimeter 88890074 to measure resistance
between the two contact pins on the sensor. The
resistance shall agree with the values in the chart.
Measurement
value points
Nominal
resistance value
Nominal voltage
measured over
the sensor
1–2 R ≈ 185 Ω
at -20° C
U ≈ 0.78 V
at -20° C
1–2 R ≈ 200 Ω
at 0° C
U ≈ 0.84 V
at 0° C
1–2 R ≈ 220 Ω
at 25° C
U ≈ 0.90 V
at 25° C
1–2 R ≈ 238 Ω
at 50° C
U ≈ 0.96 V
at 50° C
1–2 R ≈ 276 Ω
at 100° C
U ≈ 1.08 V
at 100° C
1–2 R ≈ 313 Ω
at 150° C
U ≈ 1.19 V
at 150° C
1–2 R ≈ 349 Ω
at 200° C
U ≈ 1.29 V
at 200° C
1–2 R ≈ 385 Ω
at 250° C
U ≈ 1.39 V
at 250° C
1–2 R ≈ 420 Ω
at 300° C
U ≈ 1.48 V
at 300° C
30-2 Fault Tracing
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