Briggs & Stratton VANGUARD M490000, Repair Manual

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DTC P0112 Signal Voltage Low (Non-Scan Diagnostics)
Step Action Yes No
1 1. Disconnect and reconnect MAT sensor and ECM J2 (Black)
connectors.
2. Turn Ignition ON, Engine OFF.
3. Clear codes.
4. Turn Ignition OFF, and then back ON.
5. Does DTC return?
Go to step 2. Problem corrected.
2 1. Turn Ignition OFF.
2. Back probe terminal 2 (Red/White wire) of MAT sensor
connector.
3. Connect terminal 2 back probe to red meter test lead on DVOM.
4. Back probe terminal 4 (Brown wire) of MAT sensor connector.
5. Connect terminal 4 back probe to black meter test lead on
DVOM.
6. Set DVOM to read volts DC.
7. Turn Ignition ON, Engine OFF.
8. Does DVOM read 4.7-5.0 volts DC?
MAT sensor OK. Go to step 3.
3 1. Turn Ignition OFF.
2. Remove probe from terminal 2, and back probe terminal 3 (Tan/
Black wire) of MAT sensor connector.
3. Turn Ignition ON, Engine OFF.
4. Does DVOM read 0.5-4.5 volts DC?
MAT sensor OK. Reading is below
0.5 volts DC.
Replace MAT sensor.
4 1. Turn Ignition OFF.
2. Remove probe from terminal 3, and back probe ECM connector
terminal J2-08 (Tan/Black wire).
3. Turn Ignition ON, Engine OFF.
4. Does DVOM read 0.5-4.5 volts DC?
MAT sensor circuit OK. Go to step 5.
5 Are both MAT sensor and ECM J2 connectors fully mated? Repair or replace EFI wire harness. Connect connectors.
MAT Sensor Connector ECM J2 (Black) Connector
Not for
Reproduction