PROPEL SPEED CHANGE PROPORTIONAL
JT07062 Test Harness
The purpose of test is to check continuity in wiring
harness to the propel speed change solenoid valve (C)
coil and there is a signal from engine and pump controller.
NOTE: Pressure reading shown on the laptop computer
for "10 Propel motor control pressure" is a
calculated pressure from the electrical signal in
the engine and pump controller. A typical reading
of 65.9 psi is displayed when propel function is in
neutral or propelling in slow speed. A typical
reading of 426 psi is displayed when propelling in
fast speed with no other function actuated. The
readings indicates that the propel speed switch,
pump control pressure sensors, and front and rear
pump pressure sensors are OK and a electrical
signal is generated. (For circuit operation, see
Propel Motor Speed Change Circuit Operation in
B--Speed Sensing Solenoid Valve (SD)
while engine is running or with key
C--Propel Speed Change Solenoid (SI)
D--Power Boost Solenoid Valve (SG)
switch on can damage engine and
pump controller or other electrical
1. Stop engine. Turn key switch to OFF.
2. Remove wire clip. Wiggle connector half and pull apart;
do not pull on wiring leads.
3. Install test harness in series with wiring harness and
propel speed change solenoid valve (C).
4. Turn key switch to ON but do not start engine.
5. Turn propel speed switch to fast speed (rabbit).
Turn propel speed switch to slow speed propel (turtle).
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