Oshkosh JLG 1500SJ, Service And Maintenance Manual

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SECTION 3 - CHASSIS & TURNTABLE
3-192 – JLG Lift – 3121262
DTC 1652- TPS1 Loss of Communications
• Throttle Actuator (with serial/digital position feedback)
• Check Condition- Key On, Engine Running and/or Stopped
• Fault Condition- ECM is expecting to receive throttle posi-
tion information from the throttle actuator and is not.
• Corrective Action(s)- Illuminate MIL, sound audible warn-
ing or illuminate secondary warning lamp. Shutdown
engine.
• Non-emissions related fault
In the case of a throttle actuator with serial/digital position
feedback, the ECM receives a constant data stream from the
throttle actuator. If the communication is absent or inter-
rupted, the ECM can no longer control the position of the
throttle.
This fault will set if the key is on, the throttle actuator is receiv-
ing power, and the ECM is not receiving digital information
from the actuator.
Diagnostic Aids
• Verify that the throttle actuator 5V supply voltage is pres-
ent at the actuator.
• Check for a all four TPS feedback wires for short circuits.
• Check TPS SER+ and TPS SER- wire routing with respect to
noise sources (ignition coils, spark plug coil wires, etc.) and
shield if necessary.
PINK/WHITE
4
3
5
1
2
TAN/ORANGE
GREEN/RED
PURPLE/BLUE
BLACK/GREEN