Kohler Aegis LH775 Service Manual page 36

EFI System
Following chart lists fault codes, what they correspond to, and what visual indications will be. Following chart is a
list of individual codes with an explanation of what triggers them, what symptoms might be expected, and probable
causes.
Diagnostic Code Summary
Blink OBD2
Code P-Code
– – No RPM Signal
21 P0335 Loss of Synchronization
22 P0122 TPS - Open or Short Circuit to Ground
22 P0123 TPS - Short Circuit to Battery
23 P0601 Defective ECU
24 - Engine Speed Sensor
31 P0174 System too Lean
31 P0132 O2 Sensor Circuit: Shorted to Battery
32 P0134 O2 Sensor Circuit: No Activity Detected
33 P0175 System too Rich
33 P0020 O2 Sensor Control at Upper Limit
34 P0171 Maximum Adaption Limit Reached
34 P0172 Minimum Adaption Limit Reached
42 P0117 Temperature Sensor Circuit: Shorted to Ground
42 P0118 Temperature Sensor Circuit: Open Circuit or Short to Battery
43 P1670 Failure Completing Autolearn - TPS Offset below minimum allowable limit
44 P1671 Failure Completing Autolearn - TPS Offset above maximum allowable limit
51 P1260 Injector 1 - Open Circuit
51 P0261 Injector 1 - Short Circuit to Ground
51 P0262 Injector 1 - Short Circuit to Battery
52 P1263 Injector 2 - Open Circuit
52 P0264 Injector 2 - Short Circuit to Ground
52 P0265 Injector 2 - Short Circuit to Battery
54 P0655 High Temperature Warning Lamp Circuit Open
54 P1657 High Temperature Warning Lamp Circuit Shortened to Ground
54 P1658 High Temperature Warning Lamp Circuit Shorted to Voltage
55 P1651 MIL Lamp - Open Circuit
55 P1652 MIL Lamp - Short Circuit to Ground
55 P1653 MIL Lamp - Short Circuit to Battery
56 P1231 Pump Relay - Open Circuit
56 P1232 Pump Relay - Short Circuit to Ground
56 P1233 Pump Relay - Short Circuit to Battery
58 P1480 Cooling Fan Driver Circuit Open
58 P1481 Cooling Fan Driver Circuit Shorten to Ground
58 P1482 Cooling Fan Driver Circuit Shorten to Voltage
61 – End of Code Transmission
NOTE: 1. O2 Sensor Short to Battery diagnostic detection is disabled with SAS fuel-cutoff calibrated out.
2. System too Lean used to be O2 Sensor - Short to Ground (P0131).
3. System too Rich used to be O2 Sensor Control at Lower Limit (P0019).
4. Will not blink out.
MIL Lamp is always switched OFF when failure is SPORADIC.
36
Condition or Failure Description
KohlerEngines.com
MIL Note
Illuminated
Y
Y
Y
Y
Y
Y 4
Y 2
Y 1
Y
Y 3
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
N 4
N 4
N 4
N
Y
Y
Y
Y
Y
N
N
N
N
66 690 07 Rev. --