Toyota 1 MZ–FE Manual page 538

EG2–538
DIAGNOSTIC CHART
Check operation of speedometer.
Check for short in harness and connector between
terminal SP1 and body ground.
Check voltage of terminal SP1.
Check for open in harness and connector between
J/6 No.3 and combination meter.
Check and replace ECM.
1MZ–FE ENGINE – CIRCUIT INSPECTION
Check speedometer circuit
Repair or replace harness or connector.
Check for open in harness and connector
between J/B No.3 and ECM.
Repair or replace harness or connector.