Briggs & Stratton BIG BLOCK EFI, Repair Manual

Page: 41 / 142

Section 2: Troubleshooting DTCs 37
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 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
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.
4
1. Manually move throttle slowly and steadily toward
Wide Open Throttle position while observing volt-
age 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.
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.
DTC P0122 Throttle Position Sensor (TPS)
Non-Scan Diagnostics
1
2
3
1 3 2
Figure 2-25 TPS Connector.