Briggs & Stratton VANGUARD M490000, Repair Manual

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DTC P0122 Signal Voltage Low or Open (Non-Scan Diagnostics)
Step Action Yes No
1 1. Disconnect and reconnect TPS 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 (Brown wire) of TPS connector.
3. Connect terminal 2 back probe to red meter test lead on DVOM.
4. Back probe terminal 1 (Red/White wire) of TPS connector.
5. Connect terminal 1 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?
Go to step 3. Go to step 5.
3 1. Turn Ignition OFF.
2. Remove probe from terminal 2, and back probe terminal 3 (Pink/
Black wire) of TPS connector.
3. Start and run engine at idle speed.
4. Does DVOM read 0.5-0.75 volts DC?
Go to step 4. Reset TPS.
See TPS Removal/Installation/
Adjustment in SECTION 5 - REMOVAL/
INSTALLATION .
4 1. Manually move throttle slowly and steadily toward Wide Open
Throttle position while observing voltage on DVOM.
2. Does voltage steadily increase from 0.73 +/- 0.02 volts?
TPS OK. Reading is below 0.5 volts DC.
Reset or replace TPS.
See TPS Removal/Installation/
Adjustment in SECTION 5 - REMOVAL/
INSTALLATION .
5 1. Not getting ground thru 5 volt return circuit.
2. Are both TPS and ECM J2 (Black) connectors fully mated?
Repair or replace
EFI wire harness.
Connect connectors
TPS Connector
Not for
Reproduction