Dtc P0112 Signal Voltage Low (Non-Scan Diagnostics) - Briggs & Stratton VANGUARD M490000 Repair Manual

DTC P0112 Signal Voltage Low (Non-Scan Diagnostics)

Step
1 1. Disconnect and reconnect MAT sensor and ECM J2 (Black)
connectors.
2. Turn Ignition ON, Engine OFF.
2
3. Clear codes.
4. Turn Ignition OFF, and then back ON.
5. Does DTC return?
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?
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?
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?
5 Are both MAT sensor and ECM J2 connectors fully mated?
MAT Sensor Connector
28
Action Yes
Go to step 2.
MAT sensor OK.
MAT sensor OK.
MAT sensor circuit OK.
Repair or replace EFI wire harness.
ECM J2 (Black) Connector
No
Problem corrected.
Go to step 3.
Reading is below
0.5 volts DC.
Replace MAT sensor.
Go to step 5.
Connect connectors.