TROUBLESHOOTING GUIDE — DIAGNOSTIC INDEX

F-18index toc

DIAGNOSTIC INDEX

Diagnostic Index

No.	TROUBLESHOOTING ITEM	DESCRIPTION	PAGE
1	Will not crank or cranks slowly	Refer to Engine Electrical System	G- 4
2	Cranks normally but will not start (No combustion)	Engine cranks at normal speed but shows no sign of "firing"	F-22
3	Cranks normally but will not start (Partial combustion) — When engine is cold	Engine cranks at normal speed but shows partial combustion and will not continue to run	F-22
4	Cranks normally but will not start (Partial combustion) — After warm-up	Engine cranks at normal speed but shows partial combustion and will not continue to run after running and hot soaked	F-24
5	Cranks normally but hard to start — Always	Same condition as No.5 when engine is cold Restarts OK after warm-up	F-26
6	Cranks normally but hard to start — When engine is cold	Engine cranks excessively at idle in every condition	F-28
7	Cranks normally but hard to start — After warm-up	Same condition as No.5 after running and hot soaked Starts normally when cold	F-29
8	Rough idle — Always	Engine vibrates excessively at idle in every condition	F-30
9	Low idle speed/Rough idle — Before warm-up	Engine speed low or engine vibrates excessively at idle during warm-up	F-32
10	Low idle speed/Rough idle — After warm-up	Engine speed low or engine vibrates excessively after warm-up	F-34
11	High idle speed — After warm-up	Engine idle excessive for operation mode	F-36
12	Low idle speed — When A/C, P/S, or E/L ON	Engine speed decreases at idle when A/C, P/S, or E/L is ON	F-38
13	Rough idle just after starting	Engine starts normally but vibrates excessively only just after starting	F-39
14	Idle moves up and down	Engine speed up and down repeatedly at idle	F-40
15	Engine stalls at idle — Always	Engine starts normally but vibrates excessively and stalls at idle in every condition	F-42
16	Engine stalls at idle — Before warm-up	Engine runs normally at idle during warm-up but stalls at idle before warm-up	F-44
17	Engine stalls at idle — After warm-up	Engine runs normally at idle during warm-up but becomes rough and stalls after warm-up	F-45
18	Engine stalls during start-up	Engine unexpectedly stops running while starting	F-46
19	Engine stalls on deceleration	Engine unexpectedly stops running while decelerating or after deceleration	F-48
20	Engine stalls at idle — When A/C, P/S, or E/L ON	Engine unexpectedly stops running at idle when A/C, P/S, or E/L is ON	F-50
21	Engine stalls suddenly (intermittent)	Engine intermittenly stops running	F-51
22	Hesitates/Stumbles on acceleration	Flat spot occurs just after accelerator is depressed or mild jerking occurs during acceleration	F-52
23	Bucks during cruising	Unexpected, usually relative change in engine power	F-54
24	Lack of power	Performance under poor load Maximum speed reduced	F-56
25	Poor acceleration	Performance poor while accelerating	F-60
26	Runs rough on deceleration/Backfire	Engine runs rough while decelerating and abnormal combustion in exhaust system	F-64
27	Knocking	Abnormal combustion accompanied by audible "pinging" noise	F-66
28	Fuel odor	Gasoline odor in cabin	F-68
29	Exhaust sulfur smell	Exhaust gas smells abnormal (rotten egg smell)	F-69
30	High oil consumption	Oil consumption excessive	F-69
31	Poor fuel economy	Fuel economy unsatisfactory	F-70

TROUBLESHOOTING ITEMWill not crank or cranks slowly

DESCRIPTIONRefer to Engine Electrical System

PAGEG- 4

TROUBLESHOOTING ITEMCranks normally but will not start (No combustion)

DESCRIPTIONEngine cranks at normal speed but shows no sign of "firing"

PAGEF-22

TROUBLESHOOTING ITEMCranks normally but will not start (Partial combustion) — When engine is cold

DESCRIPTIONEngine cranks at normal speed but shows partial combustion and will not continue to run

PAGEF-22

TROUBLESHOOTING ITEMCranks normally but will not start (Partial combustion) — After warm-up

DESCRIPTIONEngine cranks at normal speed but shows partial combustion and will not continue to run after running and hot soaked

PAGEF-24

TROUBLESHOOTING ITEMCranks normally but hard to start — Always

DESCRIPTIONSame condition as No.5 when engine is cold Restarts OK after warm-up

PAGEF-26

TROUBLESHOOTING ITEMCranks normally but hard to start — When engine is cold

DESCRIPTIONEngine cranks excessively at idle in every condition

PAGEF-28

TROUBLESHOOTING ITEMCranks normally but hard to start — After warm-up

DESCRIPTIONSame condition as No.5 after running and hot soaked Starts normally when cold

PAGEF-29

TROUBLESHOOTING ITEMRough idle — Always

DESCRIPTIONEngine vibrates excessively at idle in every condition

PAGEF-30

TROUBLESHOOTING ITEMLow idle speed/Rough idle — Before warm-up

DESCRIPTIONEngine speed low or engine vibrates excessively at idle during warm-up

PAGEF-32

TROUBLESHOOTING ITEMLow idle speed/Rough idle — After warm-up

DESCRIPTIONEngine speed low or engine vibrates excessively after warm-up

PAGEF-34

TROUBLESHOOTING ITEMHigh idle speed — After warm-up

DESCRIPTIONEngine idle excessive for operation mode

PAGEF-36

TROUBLESHOOTING ITEMLow idle speed — When A/C, P/S, or E/L ON

DESCRIPTIONEngine speed decreases at idle when A/C, P/S, or E/L is ON

PAGEF-38

TROUBLESHOOTING ITEMRough idle just after starting

DESCRIPTIONEngine starts normally but vibrates excessively only just after starting

PAGEF-39

TROUBLESHOOTING ITEMIdle moves up and down

DESCRIPTIONEngine speed up and down repeatedly at idle

PAGEF-40

TROUBLESHOOTING ITEMEngine stalls at idle — Always

DESCRIPTIONEngine starts normally but vibrates excessively and stalls at idle in every condition

PAGEF-42

TROUBLESHOOTING ITEMEngine stalls at idle — Before warm-up

DESCRIPTIONEngine runs normally at idle during warm-up but stalls at idle before warm-up

PAGEF-44

TROUBLESHOOTING ITEMEngine stalls at idle — After warm-up

DESCRIPTIONEngine runs normally at idle during warm-up but becomes rough and stalls after warm-up

PAGEF-45

TROUBLESHOOTING ITEMEngine stalls during start-up

DESCRIPTIONEngine unexpectedly stops running while starting

PAGEF-46

TROUBLESHOOTING ITEMEngine stalls on deceleration

DESCRIPTIONEngine unexpectedly stops running while decelerating or after deceleration

PAGEF-48

TROUBLESHOOTING ITEMEngine stalls at idle — When A/C, P/S, or E/L ON

DESCRIPTIONEngine unexpectedly stops running at idle when A/C, P/S, or E/L is ON

PAGEF-50

TROUBLESHOOTING ITEMEngine stalls suddenly (intermittent)

DESCRIPTIONEngine intermittenly stops running

PAGEF-51

TROUBLESHOOTING ITEMHesitates/Stumbles on acceleration

DESCRIPTIONFlat spot occurs just after accelerator is depressed or mild jerking occurs during acceleration

PAGEF-52

TROUBLESHOOTING ITEMBucks during cruising

DESCRIPTIONUnexpected, usually relative change in engine power

PAGEF-54

TROUBLESHOOTING ITEMLack of power

DESCRIPTIONPerformance under poor load Maximum speed reduced

PAGEF-56

TROUBLESHOOTING ITEMPoor acceleration

DESCRIPTIONPerformance poor while accelerating

PAGEF-60

TROUBLESHOOTING ITEMRuns rough on deceleration/Backfire

DESCRIPTIONEngine runs rough while decelerating and abnormal combustion in exhaust system

PAGEF-64

TROUBLESHOOTING ITEMKnocking

DESCRIPTIONAbnormal combustion accompanied by audible "pinging" noise

PAGEF-66

TROUBLESHOOTING ITEMFuel odor

DESCRIPTIONGasoline odor in cabin

PAGEF-68

TROUBLESHOOTING ITEMExhaust sulfur smell

DESCRIPTIONExhaust gas smells abnormal (rotten egg smell)

PAGEF-69

TROUBLESHOOTING ITEMHigh oil consumption

DESCRIPTIONOil consumption excessive

PAGEF-69

TROUBLESHOOTING ITEMPoor fuel economy

DESCRIPTIONFuel economy unsatisfactory

PAGEF-70

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TROUBLESHOOTING GUIDE — DIAGNOSTIC INDEX

DIAGNOSTIC INDEX

Diagnostic Index

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