Secm Fault Codes And Diagnostics - Kohler 5ECD Service Manual

4.5.3

SECM Fault Codes and Diagnostics

Fault
Code
Displayed Description
No Faults (Fault Code 0)
EC9 Throttle Position Sensor
(TPS1) Input High
EC10* Throttle Position Sensor
(TPS1) Range High
EC11* Throttle Position Sensor
(TPS1) Range Low
EC12 Throttle Position Sensor
(TPS1) Input Low
EC39 Electronic Throttle Control
(ETC) Sticking
EC40* Electronic Spark Trigger
(EST) 1 Low
EC41* Electronic Spark Trigger
(EST) 1 High
EC42* Electronic Spark Trigger
(EST) 2 Low
* Indicates a stored fault code.
TP-6391 9/08
Check
Fault appears if the sensor signal wire is shorted, the sensor has failed, or the SECM has
failed. Check the throttle connector and sensor wiring for a shorted circuit:
ETC Pin 6 to SECM Pin 17 (SIGNAL)
ETC Pin 2 to SECM Pin 1 (GND)
Fault appears if the sensor potentiometer has malfunctioned. Check for dirt or oxidation on the
sensor traces. Check the throttle connector and pins for corrosion. To check, disconnect the
throttle connector and measure the resistance of 1.25 kOhms ¦ 30% from:
TPS Pin 2 (GND) to Pin 6 (TPS1 SIGNAL)
TPS Pin 3 (PWR) to Pin 6 (TPS1 SIGNAL)
NOTE: Do not service this sensor. Repair by replacing the throttle body assembly.
Fault appears if the sensor potentiometer has malfunctioned. Check for dirt or oxidation on the
sensor traces. Check the throttle connector and pins for corrosion. To check, disconnect the
throttle connector and measure the resistance of 1.25 kOhms ¦ 30% from:
TPS Pin 2 (GND) to Pin 6 (TPS1 SIGNAL)
TPS Pin 3 (PWR) to Pin 6 (TPS1 SIGNAL)
NOTE: Do not service this sensor. Repair by replacing the throttle body assembly.
Fault appears if the sensor signal wire is disconnected or the circuit is opened to the SECM.
(EC12 and EC11 are expected faults when the ETC connector is unplugged). Check the
throttle connector connection and sensor for an open circuit:
ETC Pin 6 to SECM Pin 17 (SIGNAL)
ETC Pin 2 to SECM Pin 1 (GND)
Fault appears if either of the electronic throttle control driver signals are opened or
disconnected. This happens if the throttle plate sticks inside the throttle body. Check for debris
or obstructions inside the throttle body; a loose throttle plate, or the throttle-plate shaft for
bearing wear. Check the ETC driver wiring for an open circuit:
ETC+ Pin 1 to SECM Pin 22
ETC-- Pin 4 to SECM Pin 24
Check the ETC internal motor drive by disconnecting the throttle connector and measuring the
motor drive resistance at the throttle:
TPS Pin 1 (+DRIVER) to Pin 4 (--Driver) approx. 3.0 Ohms ¦ 30%.
NOTE: Do not service the throttle components. Repair or replace the throttle body assembly.
The Electronic Spark Trigger is a current driver signal. This fault appears if the signal from the
SECM is shorted to ground or the coil driver signal is low or undercurrent. Check the coil driver
wiring and connector for shorts:
SECM Pin 7 (EST 1) to COIL Pin A
Verify GND on COIL Pin B
Verify GND on COIL Pin C
Verify GND on COIL Pin D
Verify +12VDC on COIL Pin E
To check the internal circuit, disconnect the coil connector and measure the resistance from pin
to pin. See Figure 5-20.
The Electronic Spark Trigger is a current driver signal. This fault appears if the signal from the
SECM is open or lost or the coil driver signal is high or overcurrent.
Check the coil driver wiring for an open circuit or disconnected connector:
SECM Pin 7 (EST 1) to COIL Pin A
Verify GND on COIl Pin B
Verify GND on COIL Pin C
Verify GND on COIL Pin D
Verify +12VDC on COIL Pin E
To check the internal circuit, disconnect the coil connector and measure the resistance from pin
to pin. See Figure 5-20.
The Electronic Spark Trigger is a current driver signal and this fault appears if the signal from
the SECM is shorted to ground or the coil driver signal is low or undercurrent. Check the coil
driver wiring and connector for shorts:
SECM Pin 7 (EST1) to COIL Pin A
Verify GND on COIL Pin B
Verify GND on COIL Pin C
Verify GND on COIL Pin D
Verify +12VDC on COIL Pin E
To check the internal circuit, disconnect the coil connector and measure the resistance from pin
to pin. See Figure 5-20.
Section 4 Controller 29