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CONTROL SYSTEM F–48–8 4F Cooling fan control Cooling fan relay Idling ECT below 100 °C {212 °F} B+ • Inspect cooling fan relay • Inspect related harness A/C operating Below 1.0 4G IAC (+) IAC valve • Inspect using the wave profile. (See • Inspect IAC valve (See CONTROL (IAC) ) • Inspect related harness 4H EGR valve #2 coil EGR valve Ignition switch ON B+ • Inspect EGR valve (See ) • Inspect related harness Idle B+ 4I Starter relay control Starter relay* 1 TR switch* 2 Under any condition Below 1.0 • Perform “On-Board Diagnostic Test” • Inspect related harness 4J IAC (–) IAC valve • Inspect using the wave profile. (See • Inspect IAC valve (See CONTROL (IAC) ) • Inspect related harness 4K EGR valve #3 coil EGR valve Ignition switch ON B+ • Inspect EGR valve (See ) • Inspect related harness Idle B+ 4L Cooling fan control Cooling fan relay Idling ECT below 100 °C {212 °F} B+ • Inspect cooling fan relay • Inspect related harness A/C operating Below 1.0 4M* 4 OCV control OCV • Inspect using the wave profile. (See • Inspect OCV valve (See CONTROL VALVE • Inspect related harness 4N EGR valve #4 coil EGR valve Ignition switch ON Below 1.0 • Inspect EGR valve (See ) • Inspect related harness Idle Below 1.0 4O A/C A/C relay A/C operating Below 1.0 • Inspect A/C relay • Inspect related harness A/C not operating B+ 4P* 7 Fuel pump control Fuel pump relay Ignition switch ON B+ • Inspect fuel pump relay • Inspect related harness Cranking Below 1.0 Idle Below 1.0 4Q* 6 Fuel pump control Fuel pump relay Ignition switch ON B+ • Inspect fuel pump relay • Inspect related harness Cranking Below 1.0 Idle Below 1.0 Terminal Signal Connected to Test condition Voltage (V) Action |