This diagnosis for SPN 3588/FMI 5 is typically an open circuit.

112.3.1 Open Circuit Check
Check as follows:
1. Disconnect the Ether Start connector at the Ether Injection Relay.
2. Turn the ignition ON (key ON, engine OFF).
3. Measure the voltage between pin A of the Ether Injection Relay connector and ground.
[a] If the voltage is greater than 11.5 volts, go to step 4.
[b] If the voltage is less than 1.5 volts, repair the open between pin A of the Ether
Injection Relay connector and pin 91 of the 120–pin connector. Refer to section
4. Check the resistance across the Ether Injection Relay connector.
[a] If the resistance is less than 5 Ω, repair the open between the Ether Injection Relay
connector and pin 70 of the 120–pin MCM connector. Refer to section
[b] If the resistance is greater than 15 Ω or open, replace the Ether Injection Relay.
Refer to section Verify Repairs
Verify repairs as follows:
1. Turn ignition OFF.
2. Reconnect any electrical connections that were disconnected to perform the diagnosis.
3. Clear codes with DDDL 7.0 or latest version.
4. Start and bring engine up to operating temperature (over 140°F/60°C).
5. Verify operation is satisfactory and no warning lamps illuminate. If warning lamps
illuminate, troubleshoot the codes. If assistance is required, call the Detroit Diesel
Customer Support Center at 313–592–5800.

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