If the engine runs fine after it has started and warmed up, the most likely reason would be worn spark plugs. Replace the spark plugs with OEM spark plugs. They are cheap enough and should be done anyway if its been a while.
If the engine still runs rough or the check engine light is on, it will require pulling the engine trouble codes first.
Toyota Camry and Cressida have two separate diagnostic connectors and two separate diagnostic modes which both provide access to the trouble codes. See accessing Trouble Codes for more information.
Preparatory Conditions
Battery voltage 11 Volt minimum
Closed throttle position (CTP) switch full closed
Transmission in neutral position
All auxiliary equipment, including air conditioning, switched OFF
Engine at normal operating temperature
Accessing Trouble Codes
Self-Diagnosis – Normal Mode Switch ignition ON. Do NOT start engine.
Check MIL illuminates
Switch ignition OFF
Cressida – jump DLC terminals TE1 and E1 with a short lead 1 or 2
Camry – jump DLC terminals TE1 and E1 with a short lead 1 or 3
Count MIL flashes and compare with trouble code table below
First flashes of .5 second duration indicate ‘tens’, after a 1.5 second pause, next flashes of .5 second duration indicate ‘units’
A 2.5 second pause occurs between codes
After a 4.5 second pause, trouble codes will be repeated
Switch ignition OFF
Remove jump lead
Self-Diagnosis – Test Mode Carry out preparatory conditions
Jump DLC terminals TE2 and E1 with a short lead 1
Switch ignition ON. Do NOT start engine
Check MIL is flashing to confirm test mode is operating
NOTE: Test mode will not be activated if the DLC terminals are connected after the ignition switch is turned ON.
Start the engine
Drive vehicle over 10 mph to simulate possible fault conditions
Stop vehicle
Jump DLC terminals TE1 and E1 with a short lead 1
Count MIL flashes and compare with trouble code table below
Switch ignition OFF
Remove jump leads
If the engine runs fine after it has started and warmed up, the most likely reason would be worn spark plugs. Replace the spark plugs with OEM spark plugs. They are cheap enough and should be done anyway if its been a while.
If the engine still runs rough or the check engine light is on, it will require pulling the engine trouble codes first.
– No Start Diagnostics
– Toyota OBD Trouble Codes
Toyota Camry and Cressida have two separate diagnostic connectors and two separate diagnostic modes which both provide access to the trouble codes. See accessing Trouble Codes for more information.
Preparatory Conditions
Battery voltage 11 Volt minimum
Closed throttle position (CTP) switch full closed
Transmission in neutral position
All auxiliary equipment, including air conditioning, switched OFF
Engine at normal operating temperature
Accessing Trouble Codes
Self-Diagnosis – Normal Mode Switch ignition ON. Do NOT start engine.
Check MIL illuminates
Switch ignition OFF
Cressida – jump DLC terminals TE1 and E1 with a short lead 1 or 2
Camry – jump DLC terminals TE1 and E1 with a short lead 1 or 3
Count MIL flashes and compare with trouble code table below
First flashes of .5 second duration indicate ‘tens’, after a 1.5 second pause, next flashes of .5 second duration indicate ‘units’
A 2.5 second pause occurs between codes
After a 4.5 second pause, trouble codes will be repeated
Switch ignition OFF
Remove jump lead
Self-Diagnosis – Test Mode Carry out preparatory conditions
Jump DLC terminals TE2 and E1 with a short lead 1
Switch ignition ON. Do NOT start engine
Check MIL is flashing to confirm test mode is operating
NOTE: Test mode will not be activated if the DLC terminals are connected after the ignition switch is turned ON.
Start the engine
Drive vehicle over 10 mph to simulate possible fault conditions
Stop vehicle
Jump DLC terminals TE1 and E1 with a short lead 1
Count MIL flashes and compare with trouble code table below
Switch ignition OFF
Remove jump leads
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