Hint:
Past problems that seem unrelated may also help in some cases.

Operation flow
Symptom confirmation and diagnostic trouble codeDisassembly
Remove idler pulley (see page em-23)
Remove oil dipstick
Remove oil dipstick guide (see page em-57)
Remove manifold stay (see page em-57)
Remove no. 2 Manifold stay (see page em-58)
Remove no. 1 Exhaust manifold heat
insulator (see page em-58)
Remove exhaust manifold converter subas ...
Removal
Discharge refrigerant from
refrigeration system (see page ac-172)
Disconnect cable from negative battery
terminal
Caution:
Wait at least 90 seconds after disconnecting the
cable from the negative (-) battery terminal to
prevent airbag and seat belt pretensioner activation.
Remove ...
Terminals of ecu
Center airbag sensor assembly (w/ curtain
shield airbag)
Center airbag sensor assembly (w/o curtain
shield airbag)
...