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Turn the ignition switch OFF.Disconnect the F3o connector (A) from the under-dash fuse/relay box.  
 
	Turn the ignition switch ON (II).Check for voltage between the No. 3 terminal of the O1i connector and body ground. There should be 0.5 V or less. O1i CONNECTOR 
 Wire side of female terminals Is the voltage as specified? YES - Faulty OPDS unit; replace the OPDS unit.  NO - Go to step 16. |  | 
Turn the ignition switch OFF.Disconnect the C2 connector (A) from the gauge assembly.  
 
	Turn the ignition switch ON (II).Check for voltage between the No. 3 terminal of the O1i connector and body ground. There should be 0.5 V or less. O1i CONNECTOR 
 Wire side of female terminals Is the voltage as specified? YES - Short to power in the gauge assembly; replace the gauge assembly.  NO - Go to step 20. |