B2190
Read the instructions below then
start the fault diagnostic procedure.
Symptom: Vehicle with one radiator fan:
On high speed running, the fan runs at low speed which can cause engine overheating.
On low speed running, the fan runs at high speed which can lead to excessive noise from the radiator fan.
Vehicle with two radiator fans:
On high speed running, only the right-hand radiator fan runs. Low speed running is OK. This can lead to engine overheating and reduced A/C performance.
On low speed running, the left-hand fan runs at high speed, which can lead to excessive noise from the radiator fan. High speed running is OK.
High Speed Radiator Fan Relay 1. Short to B+
High Speed Radiator Fan Relay 1. Open Circuit / Short to Ground
Fault symptoms
Vehicle with one radiator fan:
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On high speed running, the fan runs at low speed which can cause engine overheating.
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On low speed running, the fan runs at high speed which can lead to excessive noise from the radiator fan.
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Vehicle with two radiator fans:
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On high speed running, only the right-hand radiator fan runs. Low speed running is OK. This can lead to engine overheating and reduced A/C performance.
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On low speed running, the left-hand fan runs at high speed, which can lead to excessive noise from the radiator fan. High speed running is OK.
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Conditions
The control module output is monitored and a diagnostic trouble code generated for:
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Shorting to ground/open circuit.
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Shorting to battery positive (B+).
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Diagnostic help
The control module output can be activated with the tester.
Check the wiring
Jiggle the wiring harness at several points and in different directions to reveal intermittent breaks and short-circuits in the wiring harness. Observe the multimeter, test lamp or diagnostic instrument while doing this.
