Engine Mechanical Troubleshooting - Toyota 7M-GE Repair Manual

LM-4
I
ENGINE MECHANICAL -* Troubleshooting
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TROUBLESHOOTING
Problem
Possible cause I
Remedy Page
Engine overheats
Cooling system faulty
Troubleshoot cooling system co-4
Incorrect ignition timing Reset timing
EM-1 7
Engine will not crank or Starting system faulty
Troubleshoot starting system ST-2
cranks slowly
: .
Engine will not start/ Vacuum leaks
Repair as necessary
hard to start
0 PCV hoses
"
(cranks OK)
0 (w/ EGR)
EGR valve
0 Intake manifold
0 Air intake chamber
0 Throttle body
0 ISC valve
Pulling in air between air flow meter and
Repair as necessary
FI-96, 93
throttle body
Ignition problems
Perform spark test
IG-5, 12
0 Ignition coil
0 Igniter
0 (7M-GE)
Distributor
(7M-GTE)
Cam position sensor
High-tension cord disconnected or broken
Inspect cord
IG-6, 13
No fuel supply to injector
Troubleshoot EFI system
FI-I 2
l
No fuel in tank
0 Fuel pump not working
l
Fuel filter clogged
0 Fuel line clogged or leaking
EFI system problems
Repair as necessary
ISC system problem
Check ISC system
FL- 108
Spark plugs faulty
Inspect plugs
IG-7
Low compression
Check compression
EM-26, 2
Rough idle, stalls or Vacuum leaks
Repair as necessary
misses
0 PCV hoses
0 (w/ EGR)
EGR valve
0 Intake manifold
0 Air intake chamber
0 Throttle body
I
0 ISC valve
Pulling in air between sir flow meter and
FI-96, 9
throttle body
Incorrect idle speed
Check ISC system
FI- 108
Incorrect ignition timing
Reset timing EM-1 7
Ignition problems
Perform spark test IG-5, 12
0 Ignition coil
0 Igniter
0 (-/M-GE)
Distributor
(-/M-GTE)
Cam position sensor
High-tension cord faulty
Inspect cord
IG-6, 13
EFI system problems
Repair as necessary
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