Repair manual

Troubleshooting the Engine Start System RD 27
wc_tx000948gb.fm 32
3 Troubleshooting the Engine Start System
Best practice The best practice when troubleshooting this system is to:
1. Isolate and check each component of this system individually.
2. When a malfunctioning component is found, repair or replace it.
3. After replacing a malfunctioning component, retry system operation.
This chapter provides procedures to check the components.
3.1 Determining Where to Begin
Prerequisites  Fully-charged battery
 Multimeter
Procedure Follow the procedure below to determine where to begin and the sequence of
checking the engine start system.
1. Place the key switch in the START position.
2. Determine if the engine cranks.
f If the engine does not crank, follow the sequence below to troubleshoot the
components of the engine start system.
f If the engine cranks, follow the sequence below to troubleshoot the compo-
nents of the engine start system.
Step Task See Topic
1. Check the fuses. 3.2
2. Check the wiring/voltage to the starter solenoid. 3.3
3. Check the key switch. 3.4
4. Check start 2 relay. 3.5
5. Check the neutral relay. 3.6
6. Check the neutral switch. 3.7
7. Check brake 3 relay. 3.8
8. Check the brake switch. 3.9
9. Check start 1 relay. 3.10
Step Task See Topic
1. Check the fuel flow. 3.11
2. Check the fuel solenoid. 3.12