DTC Detection Logic
WARNING: This page is about a different car, the 2018 Nissan Titan XD. However, it is still accessible from the selected car via links, so may be relevant.
The Engine Control Module (ECM) detected the fan control circuit Pulse Width Modulated (PWM) signal was not at system voltage when the Pulse Width Modulated (PWM) signal was commanded ON.
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DTC |
CONSULT screen terms (Trouble diagnosis content) |
DTC detection condition |
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P0691-00 |
RAD. FAN relay1 Short to GND (Fan 1 Control Circuit Low) |
Diagnosis condition |
Ignition switch is ON |
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Signal (terminal) |
(-) |
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Threshold |
Resistance between fan clutch driver and ground < 2 Ω |
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Diagnosis delay time |
Diagnostic runs when the ignition is ON and when the pulse width modulated (PWM) device is getting energized or de-energized. In some cases, the diagnostics can also run at some fixed intervals. |
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