Briggs & Stratton VANGUARD 810 EFI Repair Manual page 41

Section 2: Troubleshooting DTCs
DTC P0122 Throttle Position Sensor (TPS)
Step
1. Disconnect and reconnect TPS and ECM J2
(Black) connectors.
2. Turn Ignition ON, Engine OFF.
1
3. Clear codes.
4. Turn Ignition OFF, and then back ON.
5. Does DTC return?
1. Turn Ignition OFF.
2. Back probe terminal 2 (Brown wire) of TPS con-
nector.
3. Connect terminal 2 back probe to red meter test
lead on DVOM.
4. Back probe terminal 1 (Red/White wire) of TPS
2
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?
1. Turn Ignition OFF.
2. Remove probe from terminal 2, and back probe
3 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?
1. Manually move throttle slowly and steadily toward
Wide Open Throttle position while observing volt-
age on DVOM.
4
2. Does voltage steadily increase from 0.73 +/- 0.02
volts?
1. Not getting ground thru 5 volt return circuit.
5
2. Are both TPS and ECM J2 (Black) connectors
fully mated?
1
1
Figure 2-25 TPS Connector.
Non-Scan Diagnostics
Action
2
3
3
2
Yes
Go to step 2.
Go to step 3.
See TPS Removal/
Go to step 4.
Installation/Adjustment
Reset or replace TPS.
TPS OK.
See TPS Removal/
Installation/Adjustment
Repair or
replace EFI wire
harness.
37
No
Problem
corrected.
Go to step 5.
Reset TPS.
in Section 5.
Reading is below
0.5 volts DC.
in Section 5.
Connect
connectors.